I'm trying to plot differential equations but it's showing errors.

Question

Suraj Narayan 2020-12-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/682863-i-m-trying-to-plot-differential-equations-but-it-s-showing-errors

评论： Suraj Narayan 2020-12-6

Here is the code.....

clc
clear all
close all
syms i(t)
di = diff(i);
d2i = diff(i,2);
z = dsolve((d2i+40*di+1000*i(t)) == 0.1*diff(heaviside(t)));
i(0)==4;
di(0)==15;
z1 = diff(z); % ANS OF BIT a
subplot(2,1,1)
ezplot(z)
title('STEP RESPONCE')
xlabel('time (t)');
ylabel('(z)');
grid on;
gtext('1841014009');
subplot(2,1,2)
ezplot(z1)
title('IMPLUSE RESPONCE')
xlabel('time (t)');
ylabel('(z1)');
grid on;
gtext('1841014009');

And here is the errors

Please help me to solve this problem

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Answer 1

Ameer Hamza 2020-12-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/682863-i-m-trying-to-plot-differential-equations-but-it-s-showing-errors#answer_566903

在 MATLAB Online 中打开

You are not applying the initial condition with solving the ode. Check the following code

clc
close all
syms i(t)
di = diff(i);
d2i = diff(i,2);
cond = [i(0)==4; di(0)==15];
z = dsolve((d2i+40*di+1000*i(t)) == 0.1*diff(heaviside(t)), cond);
z1 = diff(z); % ANS OF BIT a
subplot(2,1,1)
fplot(z)
title('STEP RESPONCE')
xlabel('time (t)');
ylabel('(z)');
grid on;
gtext('1841014009');
subplot(2,1,2)
fplot(z1)
title('IMPLUSE RESPONCE')
xlabel('time (t)');
ylabel('(z1)');
grid on;
gtext('1841014009');