Stop Matlab ignoring numbers

10 Mar 2022
1 Answer
Answer Accepted
Updated 10 Mar 2022
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Hello, my code is:
t=1;
h=6.626*10^-34;
e=2.718281828459;
l=1.757*10^-29;
m=1.652*10^-29;
n=0.8*m;
o=2*pi*395581*10^9;
p=2*pi*443941*10^9;
q=2*pi*48360*10^9;
w=1;
M=[0,(0.E-323+sqrt(-1)*0.132584E5),(0.E-323+sqrt(-1)*0.E-323),( ...
0.E-323+sqrt(-1)*(-0.132584E5)),0,0,(0.E-323+sqrt(-1)*0.E-323),0, ...
0;(0.E-323+sqrt(-1)*0.132584E5),(sqrt(-1)*(-1)).*((-1).*o+w),( ...
0.E-323+sqrt(-1)*0.E-323),0,(0.E-323+sqrt(-1)*(-0.132584E5)),0,0,( ...
0.E-323+sqrt(-1)*0.E-323),0;(0.E-323+sqrt(-1)*0.E-323),(0.E-323+ ...
sqrt(-1)*0.E-323),(sqrt(-1)*(-1)).*((-1).*p+w),0,0,(0.E-323+sqrt( ...
-1)*(-0.132584E5)).*e.^(sqrt(-1).*t.*((-1).*o+p+(-1).*q+w)),0,0,( ...
0.E-323+sqrt(-1)*0.E-323);(0.E-323+sqrt(-1)*(-0.132584E5)),0,0,( ...
sqrt(-1)*(-1)).*(o+(-1).*w),(0.E-323+sqrt(-1)*0.132584E5),( ...
0.E-323+sqrt(-1)*0.E-323),(0.E-323+sqrt(-1)*0.E-323),0,0;0,( ...
0.E-323+sqrt(-1)*(-0.132584E5)),0,(0.E-323+sqrt(-1)*0.132584E5),0, ...
(0.E-323+sqrt(-1)*0.E-323),0,(0.E-323+sqrt(-1)*0.E-323),0;0,0,( ...
0.E-323+sqrt(-1)*(-0.132584E5)).*e.^(sqrt(-1).*t.*(o+(-1).*p+q+( ...
-1).*w)),(0.E-323+sqrt(-1)*0.E-323),(0.E-323+sqrt(-1)*0.E-323),( ...
sqrt(-1)*(-1)).*((-1).*q+w),0,0,(0.E-323+sqrt(-1)*0.E-323);( ...
0.E-323+sqrt(-1)*0.E-323),0,0,(0.E-323+sqrt(-1)*0.E-323),0,0,( ...
sqrt(-1)*(-1)).*(p+(-1).*w),(0.E-323+sqrt(-1)*0.132584E5).*e.^( ...
sqrt(-1).*t.*(o+(-1).*p+q+(-1).*w)),(0.E-323+sqrt(-1)*0.E-323);0,( ...
0.E-323+sqrt(-1)*0.E-323),0,0,(0.E-323+sqrt(-1)*0.E-323),0,( ...
0.E-323+sqrt(-1)*0.132584E5).*e.^(sqrt(-1).*t.*((-1).*o+p+(-1).*q+ ...
w)),(sqrt(-1)*(-1)).*(q+(-1).*w),(0.E-323+sqrt(-1)*0.E-323);0,0,( ...
0.E-323+sqrt(-1)*0.E-323),0,0,(0.E-323+sqrt(-1)*0.E-323),(0.E-323+ ...
sqrt(-1)*0.E-323),(0.E-323+sqrt(-1)*0.E-323),0]
but my output is:
M =
1.0e+15 *
Columns 1 through 5
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 - 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 2.4855i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 - 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 2.7894i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 - 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 - 2.4855i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 - 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i -0.0000 - 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
Columns 6 through 9
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 - 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.3039i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 - 2.7894i 0.0000 + 0.0000i 0.0000 + 0.0000i
0.0000 + 0.0000i -0.0000 + 0.0000i 0.0000 - 0.3039i 0.0000 + 0.0000i
0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i 0.0000 + 0.0000i
For example the second entry. It is not equal to 0. But in the output it is.How can I stop that ?

4 Comments
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KSSV
KSSV on 10 Mar 2022
They are not zeros....See that a number 1.0e+15 is multiplied to every element.
Stephen23
Stephen23 on 10 Mar 2022
Ran in:
Ran in:
"For example the second entry. It is not equal to 0. But in the output it is."
No, it is not equal to zero. Lets have a look at it:
t=1;
h=6.626*10^-34;
e=2.718281828459;
l=1.757*10^-29;
m=1.652*10^-29;
n=0.8*m;
o=2*pi*395581*10^9;
p=2*pi*443941*10^9;
q=2*pi*48360*10^9;
w=1;
M=[0,(0.E-323+sqrt(-1)*0.132584E5),(0.E-323+sqrt(-1)*0.E-323),( ...
0.E-323+sqrt(-1)*(-0.132584E5)),0,0,(0.E-323+sqrt(-1)*0.E-323),0, ...
0;(0.E-323+sqrt(-1)*0.132584E5),(sqrt(-1)*(-1)).*((-1).*o+w),( ...
0.E-323+sqrt(-1)*0.E-323),0,(0.E-323+sqrt(-1)*(-0.132584E5)),0,0,( ...
0.E-323+sqrt(-1)*0.E-323),0;(0.E-323+sqrt(-1)*0.E-323),(0.E-323+ ...
sqrt(-1)*0.E-323),(sqrt(-1)*(-1)).*((-1).*p+w),0,0,(0.E-323+sqrt( ...
-1)*(-0.132584E5)).*e.^(sqrt(-1).*t.*((-1).*o+p+(-1).*q+w)),0,0,( ...
0.E-323+sqrt(-1)*0.E-323);(0.E-323+sqrt(-1)*(-0.132584E5)),0,0,( ...
sqrt(-1)*(-1)).*(o+(-1).*w),(0.E-323+sqrt(-1)*0.132584E5),( ...
0.E-323+sqrt(-1)*0.E-323),(0.E-323+sqrt(-1)*0.E-323),0,0;0,( ...
0.E-323+sqrt(-1)*(-0.132584E5)),0,(0.E-323+sqrt(-1)*0.132584E5),0, ...
(0.E-323+sqrt(-1)*0.E-323),0,(0.E-323+sqrt(-1)*0.E-323),0;0,0,( ...
0.E-323+sqrt(-1)*(-0.132584E5)).*e.^(sqrt(-1).*t.*(o+(-1).*p+q+( ...
-1).*w)),(0.E-323+sqrt(-1)*0.E-323),(0.E-323+sqrt(-1)*0.E-323),( ...
sqrt(-1)*(-1)).*((-1).*q+w),0,0,(0.E-323+sqrt(-1)*0.E-323);( ...
0.E-323+sqrt(-1)*0.E-323),0,0,(0.E-323+sqrt(-1)*0.E-323),0,0,( ...
sqrt(-1)*(-1)).*(p+(-1).*w),(0.E-323+sqrt(-1)*0.132584E5).*e.^( ...
sqrt(-1).*t.*(o+(-1).*p+q+(-1).*w)),(0.E-323+sqrt(-1)*0.E-323);0,( ...
0.E-323+sqrt(-1)*0.E-323),0,0,(0.E-323+sqrt(-1)*0.E-323),0,( ...
0.E-323+sqrt(-1)*0.132584E5).*e.^(sqrt(-1).*t.*((-1).*o+p+(-1).*q+ ...
w)),(sqrt(-1)*(-1)).*(q+(-1).*w),(0.E-323+sqrt(-1)*0.E-323);0,0,( ...
0.E-323+sqrt(-1)*0.E-323),0,0,(0.E-323+sqrt(-1)*0.E-323),(0.E-323+ ...
sqrt(-1)*0.E-323),(0.E-323+sqrt(-1)*0.E-323),0];
It is unclear which element you mean by "second", so lets have at look at both of these:
format long G
M(1,2) % not zero
ans =
0 + 13258.4i
M(2,1) % not zero
ans =
0 + 13258.4i
Most likely you are making the mistake of confusing how data are displayed with what data are stored in memory.
Alland Kiepert
Alland Kiepert on 10 Mar 2022
So on the display there is just a 0 at certain entries because the exact terms would take too much space ?

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 Accepted Answer

Jan
Jan on 10 Mar 2022
Edited: Jan on 10 Mar 2022

0 votes

format long g
This enables more visible digits. You get the complete control over the output format, if you use fprintf() instead:
for iR = 1:size(M, 1)
for iC = 1:size(M, 2)
fprintf('%18.16g+%18.16g, ', real(M(iR, iC)), imag(M(iR, iC)));
end
fprintf('\n');
end
% [EDITED, thanks Walter!]

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Walter Roberson
Walter Roberson on 10 Mar 2022
fprintf('%18.16g+%18.16g, ', real(M(iR, iC)), imag(M(iR, iC) );

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Asked:

Alland Kiepert
Alland Kiepert
on 10 Mar 2022

Edited:

Jan
Jan
on 10 Mar 2022

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