Are you aware that the file apparently contains five identically-named matrices? With identical values (or at least, very similar values). How do you want those five identical matrices returned?
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how to load and read sparse matrix from txt file to MATLAB ?
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I had the attached file from another software in sparse formula, I am trying to load and read it in MATLAB but am unable to carry this out using :
K=spconvert(load('Ksparse.txt'))
I need to restore the sparse matrix (Ksparse)l to its origin formula (complete one) in order to carry out some operations on it
Answers (2)
Stephen23
on 7 Feb 2025
Edited: Stephen23
on 12 Feb 2025
N = {};
C = {};
F = fopen('Ksparse.txt','rt');
while ~feof(F)
N{end+1} = strtrim(fscanf(F,'%[^[]'));
C{end+1} = spconvert(fscanf(F,'%*[[ \t\n\r]%u,%u]:%f',[3,Inf]).');
end
fclose(F);
Checking:
N
N = 1x5 cell array
{'MATKS:'} {'MATKS:'} {'MATKS:'} {'MATKS:'} {'MATKS:'}
C
C = 1x5 cell array
{462x462 double} {462x462 double} {462x462 double} {462x462 double} {462x462 double}
C{2} % e.g. the 2nd matrix
ans = 462x462 sparse double matrix (5514 nonzeros)
1.0e+09 *
(1,1) 3.4640
(1,2) -0.0000
(2,2) 3.8370
(3,3) 1.7160
(3,4) -0.0000
(4,4) 0.0001
(3,5) -0.0000
(4,5) -0.0000
(5,5) 0.0001
(1,6) 0.0000
(2,6) -0.0000
(6,6) 0.0000
(1,7) -0.8890
(2,7) -0.0000
(6,7) 0.0000
(7,7) 3.4640
(1,8) -0.0000
(2,8) 0.4839
(6,8) 0.0000
(7,8) -0.0000
(8,8) 3.8370
(3,9) -0.1573
(4,9) -0.0000
(5,9) -0.0036
(9,9) 1.7160
(3,10) 0.0000
(4,10) 0.0000
(5,10) -0.0000
(9,10) -0.0000
(10,10) 0.0001
(3,11) 0.0036
(4,11) -0.0000
(5,11) 0.0000
(9,11) -0.0000
(10,11) -0.0000
(11,11) 0.0001
(1,12) 0.0000
(2,12) -0.0000
(6,12) 0.0000
(7,12) 0.0000
(8,12) -0.0000
(12,12) 0.0000
(1,13) -0.5604
(2,13) -0.3567
(6,13) -0.0000
(7,13) 0.2762
(8,13) -0.0000
(12,13) -0.0000
(13,13) 1.7300
(1,14) -0.3567
(2,14) -0.5951
(6,14) 0.0000
(7,14) -0.0000
(8,14) -1.2170
(12,14) -0.0000
(13,14) -0.0000
(14,14) 1.9210
(3,15) -0.2146
(4,15) 0.0010
(5,15) -0.0009
(9,15) -0.2731
(10,15) 0.0039
(11,15) 0.0000
(15,15) 0.8582
(3,16) -0.0010
(4,16) 0.0000
(5,16) 0.0000
(9,16) -0.0039
(10,16) 0.0000
(11,16) 0.0000
(15,16) 0.0039
(16,16) 0.0000
(3,17) 0.0009
(4,17) 0.0000
(5,17) 0.0000
(9,17) -0.0000
(10,17) -0.0000
(11,17) 0.0000
(15,17) -0.0000
(16,17) 0.0000
(17,17) 0.0000
(1,18) 0.0000
(2,18) -0.0000
(6,18) 0.0000
(7,18) 0.0000
(8,18) 0.0000
(12,18) 0.0000
(13,18) -0.0000
(14,18) -0.0000
(18,18) 0.0000
(1,19) 0.2762
(2,19) -0.0000
(6,19) -0.0000
(7,19) -0.5604
(8,19) 0.3567
(12,19) -0.0000
(13,19) -0.4427
(14,19) 0.0270
(18,19) -0.0000
(19,19) 1.7300
(1,20) -0.0000
(2,20) -1.2170
(6,20) -0.0000
(7,20) 0.3567
(8,20) -0.5952
(12,20) -0.0000
(13,20) -0.0270
(14,20) 0.2432
(18,20) -0.0000
(19,20) -0.0000
(20,20) 1.9210
(3,21) -0.2731
(4,21) 0.0039
(5,21) 0.0000
(9,21) -0.2146
(10,21) 0.0010
(11,21) 0.0009
(15,21) -0.0780
(16,21) 0.0010
(17,21) 0.0018
(21,21) 0.8582
(3,22) -0.0039
(4,22) 0.0000
(5,22) 0.0000
(9,22) -0.0010
(10,22) 0.0000
(11,22) -0.0000
(15,22) 0.0010
(16,22) 0.0000
(17,22) 0.0000
(21,22) 0.0039
(22,22) 0.0000
(3,23) -0.0000
(4,23) -0.0000
(5,23) 0.0000
(9,23) -0.0009
(10,23) -0.0000
(11,23) 0.0000
(15,23) -0.0018
(16,23) -0.0000
(17,23) 0.0000
(21,23) -0.0000
(22,23) 0.0000
(23,23) 0.0000
(1,24) 0.0000
(2,24) 0.0000
(6,24) 0.0000
(7,24) 0.0000
(8,24) 0.0000
(12,24) 0.0000
(13,24) -0.0000
(14,24) 0.0000
(18,24) 0.0000
(19,24) -0.0000
(20,24) -0.0000
(24,24) 0.0000
(1,25) -0.8890
(2,25) -0.0000
(6,25) 0.0000
(19,25) -0.5604
(20,25) -0.3567
(24,25) 0.0000
(25,25) 3.4640
(1,26) -0.0000
(2,26) 0.4839
(6,26) -0.0000
(19,26) -0.3567
(20,26) -0.5951
(24,26) -0.0000
(25,26) -0.0000
(26,26) 3.8370
(3,27) -0.1573
(4,27) 0.0000
(5,27) 0.0036
(21,27) -0.2146
(22,27) -0.0010
(23,27) 0.0009
(27,27) 1.7160
(3,28) -0.0000
(4,28) 0.0000
(5,28) -0.0000
(21,28) 0.0010
(22,28) 0.0000
(23,28) 0.0000
(27,28) -0.0000
(28,28) 0.0001
(3,29) -0.0036
(4,29) -0.0000
(5,29) 0.0000
(21,29) -0.0009
(22,29) 0.0000
(23,29) 0.0000
(27,29) -0.0000
(28,29) -0.0000
(29,29) 0.0001
(1,30) 0.0000
(2,30) 0.0000
(6,30) 0.0000
(19,30) -0.0000
(20,30) 0.0000
(24,30) 0.0000
(25,30) 0.0000
(26,30) 0.0000
(30,30) 0.0000
(1,31) -0.5604
(2,31) 0.3567
(6,31) -0.0000
(19,31) -0.4427
(20,31) 0.0270
(24,31) -0.0000
(25,31) 0.2764
(26,31) -0.0000
(30,31) -0.0000
(31,31) 1.7300
(1,32) 0.3567
(2,32) -0.5951
(6,32) -0.0000
(19,32) -0.0270
(20,32) 0.2432
(24,32) -0.0000
(25,32) -0.0000
(26,32) -1.2170
(30,32) 0.0000
(31,32) -0.0000
(32,32) 1.9210
(3,33) -0.2146
(4,33) 0.0010
(5,33) 0.0009
(21,33) -0.0780
(22,33) 0.0010
(23,33) 0.0018
(27,33) -0.2729
(28,33) 0.0039
(29,33) 0.0000
(33,33) 0.8582
(3,34) -0.0010
(4,34) 0.0000
(5,34) -0.0000
(21,34) 0.0010
(22,34) 0.0000
(23,34) 0.0000
(27,34) -0.0039
(28,34) 0.0000
(29,34) 0.0000
(33,34) 0.0039
(34,34) 0.0000
(3,35) -0.0009
(4,35) -0.0000
(5,35) 0.0000
(21,35) -0.0018
(22,35) -0.0000
(23,35) 0.0000
(27,35) -0.0000
(28,35) -0.0000
(29,35) 0.0000
(33,35) -0.0000
(34,35) 0.0000
(35,35) 0.0000
(1,36) 0.0000
(2,36) 0.0000
(6,36) 0.0000
(19,36) -0.0000
(20,36) 0.0000
(24,36) 0.0000
(25,36) 0.0000
(26,36) 0.0000
(30,36) 0.0000
(31,36) -0.0000
(32,36) 0.0000
(36,36) 0.0000
(1,37) 0.2808
(2,37) -0.0000
(6,37) 0.0000
(7,37) -0.5610
(8,37) -0.3567
(12,37) 0.0000
(25,37) -0.5610
(26,37) 0.3567
(30,37) 0.0000
(37,37) 3.4680
(1,38) -0.0000
(2,38) -1.2090
(6,38) 0.0000
(7,38) -0.3567
(8,38) -0.5942
(12,38) -0.0000
(25,38) 0.3567
(26,38) -0.5942
(30,38) 0.0000
(37,38) -0.0000
(38,38) 3.8320
(3,39) -0.2703
(4,39) -0.0039
(5,39) -0.0000
(9,39) -0.2145
(10,39) -0.0010
(11,39) 0.0009
(27,39) -0.2145
(28,39) -0.0010
(29,39) -0.0009
(39,39) 1.7160
(3,40) 0.0039
(4,40) 0.0000
(5,40) -0.0000
(9,40) 0.0010
(10,40) 0.0000
(11,40) 0.0000
(27,40) 0.0010
(28,40) 0.0000
(29,40) -0.0000
(39,40) -0.0000
(40,40) 0.0001
(3,41) 0.0000
(4,41) -0.0000
(5,41) 0.0000
(9,41) -0.0009
(10,41) 0.0000
(11,41) 0.0000
(27,41) 0.0009
(28,41) -0.0000
(29,41) 0.0000
(39,41) -0.0000
(40,41) 0.0000
(41,41) 0.0001
(1,42) -0.0000
(2,42) -0.0000
(6,42) 0.0000
(7,42) -0.0000
(8,42) 0.0000
(12,42) 0.0000
(25,42) -0.0000
(26,42) -0.0000
(30,42) 0.0000
(37,42) 0.0000
(42,42) 0.0000
(1,43) -0.5610
(2,43) 0.3567
(6,43) 0.0000
(7,43) 0.2808
(8,43) -0.0000
(12,43) 0.0000
(37,43) -0.8929
(38,43) -0.0000
(42,43) 0.0000
(43,43) 3.4680
(1,44) 0.3567
(2,44) -0.5942
(6,44) 0.0000
(7,44) -0.0000
(8,44) -1.2090
(12,44) 0.0000
(37,44) -0.0000
(38,44) 0.4812
(42,44) 0.0000
(43,44) -0.0000
(44,44) 3.8320
(3,45) -0.2145
(4,45) -0.0010
(5,45) -0.0009
(9,45) -0.2703
(10,45) -0.0039
(11,45) -0.0000
(39,45) -0.1587
(40,45) -0.0000
(41,45) -0.0036
(45,45) 1.7160
(3,46) 0.0010
(4,46) 0.0000
(5,46) -0.0000
(9,46) 0.0039
(10,46) 0.0000
(11,46) -0.0000
(39,46) 0.0000
(40,46) 0.0000
(41,46) -0.0000
(45,46) -0.0000
(46,46) 0.0001
(3,47) 0.0009
(4,47) -0.0000
(5,47) 0.0000
(9,47) 0.0000
(10,47) -0.0000
(11,47) 0.0000
(39,47) 0.0036
(40,47) -0.0000
(41,47) 0.0000
(45,47) 0.0000
(46,47) 0.0000
(47,47) 0.0001
(1,48) -0.0000
(2,48) -0.0000
(6,48) 0.0000
(7,48) -0.0000
(8,48) -0.0000
(12,48) 0.0000
(37,48) 0.0000
(38,48) -0.0000
(42,48) 0.0000
(43,48) 0.0000
(48,48) 0.0000
(1,49) -0.5610
(2,49) -0.3567
(6,49) 0.0000
(25,49) 0.2810
(26,49) -0.0000
(30,49) 0.0000
(37,49) -0.8929
(38,49) -0.0000
(42,49) 0.0000
(49,49) 3.4680
(1,50) -0.3567
(2,50) -0.5942
(6,50) -0.0000
(25,50) -0.0000
(26,50) -1.2090
(30,50) 0.0000
(37,50) -0.0000
(38,50) 0.4812
(42,50) -0.0000
(49,50) -0.0000
(50,50) 3.8310
(3,51) -0.2145
(4,51) -0.0010
(5,51) 0.0009
(27,51) -0.2702
(28,51) -0.0039
(29,51) -0.0000
(39,51) -0.1587
(40,51) 0.0000
(41,51) 0.0036
(51,51) 1.7160
(3,52) 0.0010
(4,52) 0.0000
(5,52) 0.0000
(27,52) 0.0039
(28,52) 0.0000
(29,52) -0.0000
(39,52) -0.0000
(40,52) 0.0000
(41,52) -0.0000
(51,52) -0.0000
(52,52) 0.0001
(3,53) -0.0009
(4,53) 0.0000
(5,53) 0.0000
(27,53) 0.0000
(28,53) -0.0000
(29,53) 0.0000
(39,53) -0.0036
(40,53) -0.0000
(41,53) 0.0000
(51,53) -0.0000
(52,53) 0.0000
(53,53) 0.0001
(1,54) -0.0000
(2,54) 0.0000
(6,54) 0.0000
(25,54) -0.0000
(26,54) 0.0000
(30,54) 0.0000
(37,54) 0.0000
(38,54) 0.0000
(42,54) 0.0000
(49,54) 0.0000
(50,54) 0.0000
(54,54) 0.0000
(37,55) 0.2813
(38,55) -0.0000
(42,55) 0.0000
(43,55) -0.5611
(44,55) -0.3567
(48,55) 0.0000
(49,55) -0.5611
(50,55) 0.3567
(54,55) 0.0000
(55,55) 3.4680
(37,56) -0.0000
(38,56) -1.2090
(42,56) 0.0000
(43,56) -0.3567
(44,56) -0.5940
(48,56) -0.0000
(49,56) 0.3567
(50,56) -0.5941
(54,56) 0.0000
(55,56) -0.0000
(56,56) 3.8310
(39,57) -0.2701
(40,57) -0.0039
(41,57) -0.0000
(45,57) -0.2145
(46,57) -0.0010
(47,57) 0.0009
(51,57) -0.2145
(52,57) -0.0010
(53,57) -0.0009
(57,57) 1.7160
(39,58) 0.0039
(40,58) 0.0000
(41,58) -0.0000
(45,58) 0.0010
(46,58) 0.0000
(47,58) 0.0000
(51,58) 0.0010
(52,58) 0.0000
(53,58) -0.0000
(57,58) 0.0000
(58,58) 0.0001
(39,59) 0.0000
(40,59) -0.0000
(41,59) 0.0000
(45,59) -0.0009
(46,59) 0.0000
(47,59) 0.0000
(51,59) 0.0009
(52,59) -0.0000
(53,59) 0.0000
(57,59) -0.0000
(58,59) 0.0000
(59,59) 0.0001
(37,60) -0.0000
(38,60) -0.0000
(42,60) 0.0000
(43,60) -0.0000
(44,60) 0.0000
(48,60) 0.0000
(49,60) -0.0000
(50,60) -0.0000
(54,60) 0.0000
(60,60) 0.0000
(37,61) -0.5611
(38,61) 0.3567
(42,61) 0.0000
(43,61) 0.2813
(44,61) -0.0000
(48,61) 0.0000
(55,61) -0.8933
(56,61) -0.0000
(60,61) 0.0000
(61,61) 3.4680
(37,62) 0.3567
(38,62) -0.5941
(42,62) 0.0000
(43,62) -0.0000
(44,62) -1.2090
(48,62) 0.0000
(55,62) -0.0000
(56,62) 0.4810
(60,62) 0.0000
(61,62) -0.0000
(62,62) 3.8310
(39,63) -0.2145
(40,63) -0.0010
(41,63) -0.0009
(45,63) -0.2701
(46,63) -0.0039
(47,63) -0.0000
(57,63) -0.1589
(58,63) -0.0000
(59,63) -0.0036
(63,63) 1.7160
(39,64) 0.0010
(40,64) 0.0000
(41,64) -0.0000
(45,64) 0.0039
(46,64) 0.0000
(47,64) -0.0000
(57,64) 0.0000
(58,64) 0.0000
(59,64) -0.0000
(63,64) -0.0000
(64,64) 0.0001
(39,65) 0.0009
(40,65) -0.0000
(41,65) 0.0000
(45,65) 0.0000
(46,65) -0.0000
(47,65) 0.0000
(57,65) 0.0036
(58,65) -0.0000
(59,65) 0.0000
(63,65) -0.0000
(64,65) 0.0000
(65,65) 0.0001
(37,66) -0.0000
(38,66) -0.0000
(42,66) 0.0000
(43,66) -0.0000
(44,66) -0.0000
(48,66) 0.0000
(55,66) -0.0000
(56,66) -0.0000
(60,66) 0.0000
(66,66) 0.0000
(37,67) -0.5611
(38,67) -0.3567
(42,67) 0.0000
(49,67) 0.2815
(50,67) -0.0000
(54,67) 0.0000
(55,67) -0.8933
(56,67) -0.0000
(60,67) -0.0000
(67,67) 3.4690
(37,68) -0.3567
(38,68) -0.5940
(42,68) -0.0000
(49,68) -0.0000
(50,68) -1.2080
(54,68) 0.0000
(55,68) -0.0000
(56,68) 0.4810
(60,68) -0.0000
(67,68) -0.0000
(68,68) 3.8310
(39,69) -0.2145
(40,69) -0.0010
(41,69) 0.0009
(51,69) -0.2699
(52,69) -0.0039
(53,69) -0.0000
(57,69) -0.1589
(58,69) 0.0000
(59,69) 0.0036
(69,69) 1.7160
(39,70) 0.0010
(40,70) 0.0000
(41,70) 0.0000
(51,70) 0.0039
(52,70) 0.0000
(53,70) -0.0000
(57,70) -0.0000
(58,70) 0.0000
(59,70) -0.0000
(69,70) 0.0000
(70,70) 0.0001
(39,71) -0.0009
(40,71) 0.0000
(41,71) 0.0000
(51,71) 0.0000
(52,71) -0.0000
(53,71) 0.0000
(57,71) -0.0036
(58,71) -0.0000
(59,71) 0.0000
(69,71) -0.0000
(70,71) 0.0000
(71,71) 0.0001
(37,72) -0.0000
(38,72) 0.0000
(42,72) 0.0000
(49,72) -0.0000
(50,72) 0.0000
(54,72) 0.0000
(55,72) 0.0000
(56,72) 0.0000
(60,72) 0.0000
(68,72) 0.0000
(72,72) 0.0000
(55,73) -0.5611
(56,73) 0.3567
(60,73) 0.0000
(61,73) 0.2813
(62,73) -0.0000
(66,73) 0.0000
(73,73) 3.4680
(55,74) 0.3567
(56,74) -0.5941
(60,74) 0.0000
(61,74) -0.0000
(62,74) -1.2090
(66,74) 0.0000
(73,74) -0.0000
(74,74) 3.8320
(57,75) -0.2145
(58,75) -0.0010
(59,75) -0.0009
(63,75) -0.2701
(64,75) -0.0039
(65,75) -0.0000
(75,75) 1.7160
(57,76) 0.0010
(58,76) 0.0000
(59,76) -0.0000
(63,76) 0.0039
(64,76) 0.0000
(65,76) -0.0000
(75,76) 0.0000
(76,76) 0.0001
(57,77) 0.0009
(58,77) -0.0000
(59,77) 0.0000
(63,77) 0.0000
(64,77) -0.0000
(65,77) 0.0000
(75,77) 0.0000
(76,77) 0.0000
(77,77) 0.0001
(55,78) -0.0000
(56,78) -0.0000
(60,78) 0.0000
(61,78) -0.0000
(62,78) -0.0000
(66,78) 0.0000
(73,78) -0.0000
(78,78) 0.0000
(61,79) -0.5611
(62,79) 0.3567
(66,79) 0.0000
(73,79) -0.8929
(74,79) -0.0000
(78,79) -0.0000
(79,79) 3.4680
(61,80) 0.3567
(62,80) -0.5941
(66,80) 0.0000
(73,80) -0.0000
(74,80) 0.4812
(78,80) 0.0000
(79,80) -0.0000
(80,80) 3.8320
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(177,213) -0.2144
(178,213) -0.0010
(179,213) 0.0009
(189,213) -0.1337
(190,213) -0.0019
(191,213) 0.0009
(207,213) -0.1615
(208,213) -0.0000
(209,213) 0.0036
(213,213) 0.8576
(177,214) 0.0010
(178,214) 0.0000
(179,214) 0.0000
(189,214) 0.0019
(190,214) 0.0000
(191,214) 0.0000
(207,214) -0.0000
(208,214) 0.0000
(209,214) -0.0000
(213,214) -0.0000
(214,214) 0.0000
(177,215) -0.0009
(178,215) 0.0000
(179,215) 0.0000
(189,215) 0.0009
(190,215) -0.0000
(191,215) 0.0000
(207,215) -0.0036
(208,215) 0.0000
(209,215) 0.0000
(213,215) 0.0036
(214,215) 0.0000
(215,215) 0.0000
(175,216) -0.0000
(176,216) 0.0000
(180,216) 0.0000
(187,216) -0.0000
(188,216) -0.0000
(192,216) 0.0000
(205,216) 0.0000
(206,216) 0.0000
(210,216) 0.0000
(211,216) 0.0000
(212,216) -0.0000
(216,216) 0.0000
(49,217) -0.5611
(50,217) -0.3567
(54,217) 0.0000
(67,217) -0.8939
(68,217) -0.0000
(72,217) -0.0000
(97,217) -0.5611
(98,217) 0.3567
(102,217) -0.0000
(199,217) 0.2827
(200,217) 0.0000
(204,217) 0.0000
(205,217) -0.5614
(206,217) 0.3567
(210,217) 0.0000
(217,217) 3.4710
(49,218) -0.3567
(50,218) -0.5940
(54,218) -0.0000
(67,218) -0.0000
(68,218) 0.4806
(72,218) -0.0000
(97,218) 0.3567
(98,218) -0.5940
(102,218) -0.0000
(199,218) -0.0000
(200,218) -1.2060
(204,218) 0.0000
(205,218) 0.3567
(206,218) -0.5936
(210,218) 0.0000
(217,218) -0.0000
(218,218) 3.8280
(51,219) -0.2145
(52,219) -0.0010
(53,219) 0.0009
(69,219) -0.1591
(70,219) 0.0000
(71,219) 0.0036
(99,219) -0.2145
(100,219) 0.0010
(101,219) 0.0009
(201,219) -0.2693
(202,219) -0.0039
(203,219) -0.0000
(207,219) -0.2144
(208,219) -0.0010
(209,219) -0.0009
(219,219) 1.7160
(51,220) 0.0010
(52,220) 0.0000
(53,220) 0.0000
(69,220) -0.0000
(70,220) 0.0000
(71,220) -0.0000
(99,220) -0.0010
(100,220) 0.0000
(101,220) -0.0000
(201,220) 0.0039
(202,220) 0.0000
(203,220) -0.0000
(207,220) 0.0010
(208,220) 0.0000
(209,220) -0.0000
(219,220) 0.0000
(220,220) 0.0001
(51,221) -0.0009
(52,221) 0.0000
(53,221) 0.0000
(69,221) -0.0036
(70,221) -0.0000
(71,221) 0.0000
(99,221) -0.0009
(100,221) -0.0000
(101,221) 0.0000
(201,221) 0.0000
(202,221) -0.0000
(203,221) 0.0000
(207,221) 0.0009
(208,221) -0.0000
(209,221) 0.0000
(219,221) -0.0000
(220,221) 0.0000
(221,221) 0.0001
(49,222) -0.0000
(50,222) 0.0000
(54,222) 0.0000
(67,222) 0.0000
(68,222) 0.0000
(72,222) 0.0000
(97,222) 0.0000
(98,222) 0.0000
(102,222) 0.0000
(199,222) -0.0000
(200,222) 0.0000
(204,222) 0.0000
(205,222) -0.0000
(206,222) -0.0000
(210,222) 0.0000
(217,222) 0.0000
(218,222) 0.0000
(222,222) 0.0000
(199,223) -0.5614
(200,223) -0.3567
(204,223) 0.0000
(205,223) 0.2850
(206,223) 0.0000
(210,223) 0.0000
(211,223) -0.5617
(212,223) 0.3567
(216,223) 0.0000
(217,223) -0.8969
(218,223) -0.0000
(222,223) -0.0000
(223,223) 3.4740
(199,224) -0.3567
(200,224) -0.5935
(204,224) -0.0000
(205,224) -0.0000
(206,224) -1.2020
(210,224) 0.0000
(211,224) 0.3567
(212,224) -0.5930
(216,224) 0.0000
(217,224) -0.0000
(218,224) 0.4785
(222,224) -0.0000
(223,224) -0.0000
(224,224) 3.8230
(201,225) -0.2144
(202,225) -0.0010
(203,225) 0.0009
(207,225) -0.2679
(208,225) -0.0039
(209,225) -0.0000
(213,225) -0.2144
(214,225) -0.0010
(215,225) -0.0009
(219,225) -0.1602
(220,225) 0.0000
(221,225) 0.0036
(225,225) 1.7150
(201,226) 0.0010
(202,226) 0.0000
(203,226) 0.0000
(207,226) 0.0039
(208,226) 0.0000
(209,226) -0.0000
(213,226) 0.0010
(214,226) 0.0000
(215,226) -0.0000
(219,226) -0.0000
(220,226) 0.0000
(221,226) -0.0000
(225,226) -0.0000
(226,226) 0.0001
(201,227) -0.0009
(202,227) 0.0000
(203,227) 0.0000
(207,227) 0.0000
(208,227) -0.0000
(209,227) 0.0000
(213,227) 0.0009
(214,227) -0.0000
(215,227) 0.0000
(219,227) -0.0036
(220,227) -0.0000
(221,227) 0.0000
(225,227) -0.0000
(226,227) -0.0000
(227,227) 0.0001
(199,228) -0.0000
(200,228) 0.0000
(204,228) 0.0000
(205,228) -0.0000
(206,228) 0.0000
(210,228) 0.0000
(211,228) -0.0000
(212,228) -0.0000
(216,228) 0.0000
(217,228) 0.0000
(218,228) 0.0000
(222,228) 0.0000
(223,228) -0.0000
(224,228) 0.0000
(228,228) 0.0000
(205,229) -0.5617
(206,229) -0.3567
(210,229) 0.0000
(211,229) 0.1431
(212,229) 0.0270
(216,229) 0.0000
(223,229) -0.9010
(224,229) -0.0000
(228,229) -0.0000
(229,229) 1.7380
(205,230) -0.3567
(206,230) -0.5930
(210,230) -0.0000
(211,230) -0.0270
(212,230) -0.6000
(216,230) -0.0000
(223,230) -0.0000
(224,230) 0.4757
(228,230) -0.0000
(229,230) -0.0000
(230,230) 1.9100
(207,231) -0.2144
(208,231) -0.0010
(209,231) 0.0009
(213,231) -0.1336
(214,231) -0.0019
(215,231) 0.0009
(225,231) -0.1617
(226,231) -0.0000
(227,231) 0.0036
(231,231) 0.8576
(207,232) 0.0010
(208,232) 0.0000
(209,232) 0.0000
(213,232) 0.0019
(214,232) 0.0000
(215,232) 0.0000
(225,232) -0.0000
(226,232) 0.0000
(227,232) -0.0000
(231,232) -0.0000
(232,232) 0.0000
(207,233) -0.0009
(208,233) 0.0000
(209,233) 0.0000
(213,233) 0.0009
(214,233) -0.0000
(215,233) 0.0000
(225,233) -0.0036
(226,233) 0.0000
(227,233) 0.0000
(231,233) 0.0036
(232,233) 0.0000
(233,233) 0.0000
(205,234) -0.0000
(206,234) 0.0000
(210,234) 0.0000
(211,234) -0.0000
(212,234) -0.0000
(216,234) 0.0000
(223,234) 0.0000
(224,234) 0.0000
(228,234) 0.0000
(229,234) -0.0000
(230,234) -0.0000
(234,234) 0.0000
(67,235) -0.5611
(68,235) -0.3567
(72,235) 0.0000
(97,235) -0.8936
(98,235) -0.0000
(102,235) -0.0000
(121,235) -0.5611
(122,235) 0.3567
(126,235) -0.0000
(157,235) 0.2822
(158,235) -0.0000
(162,235) -0.0000
(217,235) 0.2827
(218,235) 0.0000
(222,235) 0.0000
(223,235) -0.5614
(224,235) 0.3567
(228,235) 0.0000
(235,235) 3.4700
(67,236) -0.3567
(68,236) -0.5940
(72,236) -0.0000
(97,236) -0.0000
(98,236) 0.4808
(102,236) -0.0000
(121,236) 0.3567
(122,236) -0.5941
(126,236) -0.0000
(157,236) 0.0000
(158,236) -1.2070
(162,236) 0.0000
(217,236) -0.0000
(218,236) -1.2060
(222,236) 0.0000
(223,236) 0.3567
(224,236) -0.5936
(228,236) 0.0000
(235,236) -0.0000
(236,236) 3.8290
(69,237) -0.2145
(70,237) -0.0010
(71,237) 0.0009
(99,237) -0.1590
(100,237) 0.0000
(101,237) 0.0036
(123,237) -0.2145
(124,237) 0.0010
(125,237) 0.0009
(159,237) -0.2695
(160,237) 0.0039
(161,237) 0.0000
(219,237) -0.2693
(220,237) -0.0039
(221,237) -0.0000
(225,237) -0.2144
(226,237) -0.0010
(227,237) -0.0009
(237,237) 1.7160
(69,238) 0.0010
(70,238) 0.0000
(71,238) 0.0000
(99,238) -0.0000
(100,238) 0.0000
(101,238) -0.0000
(123,238) -0.0010
(124,238) 0.0000
(125,238) -0.0000
(159,238) -0.0039
(160,238) 0.0000
(161,238) -0.0000
(219,238) 0.0039
(220,238) 0.0000
(221,238) -0.0000
(225,238) 0.0010
(226,238) 0.0000
(227,238) -0.0000
(237,238) 0.0000
(238,238) 0.0001
(69,239) -0.0009
(70,239) 0.0000
(71,239) 0.0000
(99,239) -0.0036
(100,239) -0.0000
(101,239) 0.0000
(123,239) -0.0009
(124,239) -0.0000
(125,239) 0.0000
(159,239) -0.0000
(160,239) -0.0000
(161,239) 0.0000
(219,239) 0.0000
(220,239) -0.0000
(221,239) 0.0000
(225,239) 0.0009
(226,239) -0.0000
(227,239) 0.0000
(237,239) -0.0000
(238,239) 0.0000
(239,239) 0.0001
(67,240) -0.0000
(68,240) 0.0000
(72,240) 0.0000
(97,240) -0.0000
(98,240) 0.0000
(102,240) 0.0000
(121,240) 0.0000
(122,240) 0.0000
(126,240) 0.0000
(157,240) 0.0000
(158,240) 0.0000
(162,240) 0.0000
(217,240) -0.0000
(218,240) 0.0000
(222,240) 0.0000
(223,240) -0.0000
(224,240) -0.0000
(228,240) 0.0000
(235,240) -0.0000
(236,240) 0.0000
(240,240) 0.0000
(157,241) -0.5613
(158,241) 0.3567
(162,241) -0.0000
(217,241) -0.5614
(218,241) -0.3567
(222,241) 0.0000
(223,241) 0.2850
(224,241) 0.0000
(228,241) 0.0000
(229,241) -0.5617
(230,241) 0.3567
(234,241) 0.0000
(235,241) -0.8966
(236,241) -0.0000
(240,241) -0.0000
(241,241) 3.4740
(157,242) 0.3567
(158,242) -0.5937
(162,242) -0.0000
(217,242) -0.3567
(218,242) -0.5935
(222,242) -0.0000
(223,242) -0.0000
(224,242) -1.2020
(228,242) 0.0000
(229,242) 0.3567
(230,242) -0.5930
(234,242) 0.0000
(235,242) -0.0000
(236,242) 0.4788
(240,242) -0.0000
(241,242) -0.0000
(242,242) 3.8240
(159,243) -0.2144
(160,243) 0.0010
(161,243) 0.0009
(219,243) -0.2144
(220,243) -0.0010
(221,243) 0.0009
(225,243) -0.2679
(226,243) -0.0039
(227,243) -0.0000
(231,243) -0.2144
(232,243) -0.0010
(233,243) -0.0009
(237,243) -0.1601
(238,243) 0.0000
(239,243) 0.0036
(243,243) 1.7150
(159,244) -0.0010
(160,244) 0.0000
(161,244) -0.0000
(219,244) 0.0010
(220,244) 0.0000
(221,244) 0.0000
(225,244) 0.0039
(226,244) 0.0000
(227,244) -0.0000
(231,244) 0.0010
(232,244) 0.0000
(233,244) -0.0000
(237,244) -0.0000
Interestingly that text-file stores five copies of exactly the same matrix:
isequal(C{:})
ans = logical
1
Nithin
on 6 Feb 2025
Hi Mohamed Salem,
I understand that you want to load and read the sparse matrix data from the “Ksparse.txt” file provided. “spconvert” function is used to convert the text data to a sparse matrix. This function requires the input to be in the following format:
3 columns for each field corresponding to – row index, column index and value respectively.
As the “Ksparse.txt” file contains the data in different format compared to the required format for the “spconvert” function, using regular expressions will help in detecting the text in required format.
fileContent = fileread('Ksparse.txt');
% Extract matrix names and their data
pattern = '(?<name>\w+):\s*(?<data>(\[\s*\d+,\s*\d+\]:\s*-?\d+\.\d+e[+-]\d+\s*)+)';
matrices = regexp(fileContent, pattern, 'names');
for i = 1:length(matrices)
name = matrices(i).name;
fprintf('Matrix Name: %s\n', name);
% Extract row, column, and value for each non-zero element
elementPattern = '\[\s*(\d+),\s*(\d+)\]:\s*(-?\d+\.\d+e[+-]\d+)';
elements = regexp(matrices(i).data, elementPattern, 'tokens');
row = zeros(length(elements), 1);
col = zeros(length(elements), 1);
val = zeros(length(elements), 1);
for j = 1:length(elements)
row(j) = str2double(elements{j}{1});
col(j) = str2double(elements{j}{2});
val(j) = str2double(elements{j}{3});
end
% Create sparse matrix
sparseMatrix = sparse(row, col, val);
end
The regular expression – “\[\s*(\d+),\s*(\d+)\]:\s*(-?\d+\.\d+e[+-]\d+)” helps in converting the input text to the required text format.
For more information regarding “sparse” function, kindly refer to the following documentation:
See Also
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