The figure in my code does not appear

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The code i am working on is the euler's method for BVP. The code runs without an error but the plot window appears with no graph in it, why does this happen? and how can i fix it?

Accepted Answer

KSSV
KSSV on 16 Jan 2022
USe marker. As you are plottint point by point.
clc; close ;clear all
A = 2 ;
Kc = 1 ;
t1 = 0.1 ;
delta_h = 0 ;
h = 0.1 ;
z = 2 ;
figure
hold on
for t = 0:h:10
delta_h_next = delta_h + (z * h) ;
z_next = z - ((Kc/A)*z+((Kc/(A*t1)*delta_h))*h) ;
delta_h = delta_h_next ;
z = z_next ;
fprintf('%5.4f %11.8f \n', t, delta_h);
plot(delta_h,t,'*-r')
end
0.0000 0.20000000 0.1000 0.30000000 0.2000 0.34000000 0.3000 0.34500000 0.4000 0.33050000 0.5000 0.30600000 0.6000 0.27722500 0.7000 0.24753750 0.8000 0.21883250 0.9000 0.19210313 1.0000 0.16779681 1.1000 0.14603850 1.2000 0.12676950 1.3000 0.10983308 1.4000 0.09502639 1.5000 0.08213140 1.6000 0.07093258 1.7000 0.06122660 1.8000 0.05282698 1.9000 0.04556584 2.0000 0.03929392 2.1000 0.03387967 2.2000 0.02920785 2.3000 0.02517795 2.4000 0.02170262 2.5000 0.01870605 2.6000 0.01612263 2.7000 0.01389562 2.8000 0.01197599 2.9000 0.01032139 3.0000 0.00889529 3.1000 0.00766617 3.2000 0.00660685 3.3000 0.00569388 3.4000 0.00490705 3.5000 0.00422894 3.6000 0.00364453 3.7000 0.00314088 3.8000 0.00270683 3.9000 0.00233276 4.0000 0.00201039 4.1000 0.00173256 4.2000 0.00149313 4.3000 0.00128678 4.4000 0.00110895 4.5000 0.00095570 4.6000 0.00082363 4.7000 0.00070980 4.8000 0.00061171 4.9000 0.00052718 5.0000 0.00045432 5.1000 0.00039154 5.2000 0.00033743 5.3000 0.00029080 5.4000 0.00025061 5.5000 0.00021598 5.6000 0.00018613 5.7000 0.00016041 5.8000 0.00013824 5.9000 0.00011913 6.0000 0.00010267 6.1000 0.00008848 6.2000 0.00007625 6.3000 0.00006572 6.4000 0.00005663 6.5000 0.00004881 6.6000 0.00004206 6.7000 0.00003625 6.8000 0.00003124 6.9000 0.00002692 7.0000 0.00002320 7.1000 0.00002000 7.2000 0.00001723 7.3000 0.00001485 7.4000 0.00001280 7.5000 0.00001103 7.6000 0.00000951 7.7000 0.00000819 7.8000 0.00000706 7.9000 0.00000608 8.0000 0.00000524 8.1000 0.00000452 8.2000 0.00000389 8.3000 0.00000336 8.4000 0.00000289 8.5000 0.00000249 8.6000 0.00000215 8.7000 0.00000185 8.8000 0.00000160 8.9000 0.00000137 9.0000 0.00000118 9.1000 0.00000102 9.2000 0.00000088 9.3000 0.00000076 9.4000 0.00000065 9.5000 0.00000056 9.6000 0.00000049 9.7000 0.00000042 9.8000 0.00000036 9.9000 0.00000031 10.0000 0.00000027

More Answers (1)

KSSV
KSSV on 16 Jan 2022
Also you can save them into an array and plot after the loop:
A = 2 ;
Kc = 1 ;
t1 = 0.1 ;
delta_h = 0 ;
h = 0.1 ;
z = 2 ;
count = 0 ;
x = zeros([],1) ;
y = zeros([],1) ;
for t = 0:h:10
count = count+1 ;
delta_h_next = delta_h + (z * h) ;
z_next = z - ((Kc/A)*z+((Kc/(A*t1)*delta_h))*h) ;
delta_h = delta_h_next ;
z = z_next ;
fprintf('%5.4f %11.8f \n', t, delta_h);
x(count) = delta_h ;
y(count) = t ;
end
0.0000 0.20000000 0.1000 0.30000000 0.2000 0.34000000 0.3000 0.34500000 0.4000 0.33050000 0.5000 0.30600000 0.6000 0.27722500 0.7000 0.24753750 0.8000 0.21883250 0.9000 0.19210313 1.0000 0.16779681 1.1000 0.14603850 1.2000 0.12676950 1.3000 0.10983308 1.4000 0.09502639 1.5000 0.08213140 1.6000 0.07093258 1.7000 0.06122660 1.8000 0.05282698 1.9000 0.04556584 2.0000 0.03929392 2.1000 0.03387967 2.2000 0.02920785 2.3000 0.02517795 2.4000 0.02170262 2.5000 0.01870605 2.6000 0.01612263 2.7000 0.01389562 2.8000 0.01197599 2.9000 0.01032139 3.0000 0.00889529 3.1000 0.00766617 3.2000 0.00660685 3.3000 0.00569388 3.4000 0.00490705 3.5000 0.00422894 3.6000 0.00364453 3.7000 0.00314088 3.8000 0.00270683 3.9000 0.00233276 4.0000 0.00201039 4.1000 0.00173256 4.2000 0.00149313 4.3000 0.00128678 4.4000 0.00110895 4.5000 0.00095570 4.6000 0.00082363 4.7000 0.00070980 4.8000 0.00061171 4.9000 0.00052718 5.0000 0.00045432 5.1000 0.00039154 5.2000 0.00033743 5.3000 0.00029080 5.4000 0.00025061 5.5000 0.00021598 5.6000 0.00018613 5.7000 0.00016041 5.8000 0.00013824 5.9000 0.00011913 6.0000 0.00010267 6.1000 0.00008848 6.2000 0.00007625 6.3000 0.00006572 6.4000 0.00005663 6.5000 0.00004881 6.6000 0.00004206 6.7000 0.00003625 6.8000 0.00003124 6.9000 0.00002692 7.0000 0.00002320 7.1000 0.00002000 7.2000 0.00001723 7.3000 0.00001485 7.4000 0.00001280 7.5000 0.00001103 7.6000 0.00000951 7.7000 0.00000819 7.8000 0.00000706 7.9000 0.00000608 8.0000 0.00000524 8.1000 0.00000452 8.2000 0.00000389 8.3000 0.00000336 8.4000 0.00000289 8.5000 0.00000249 8.6000 0.00000215 8.7000 0.00000185 8.8000 0.00000160 8.9000 0.00000137 9.0000 0.00000118 9.1000 0.00000102 9.2000 0.00000088 9.3000 0.00000076 9.4000 0.00000065 9.5000 0.00000056 9.6000 0.00000049 9.7000 0.00000042 9.8000 0.00000036 9.9000 0.00000031 10.0000 0.00000027
plot(x,y)

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