# The figure in my code does not appear

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Mohamed T. Adam on 16 Jan 2022
Answered: KSSV on 16 Jan 2022
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?

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
Mohamed T. Adam on 16 Jan 2022
Thank you so much

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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