Find the meaning of each line of code

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surendra agrawal
surendra agrawal 2021-6-21
编辑： Image Analyst 2021-6-24
clearvars
clc
syms y(t) s Y Dy(t)
C = input('Enter the coeff. of D2y, Dy and y as an array: ');
F = input('Enter the non-homogeneous part f(t): ');
IC = input('Enter the initial conditions [y0 Dy0]: ');
DEq = C(1)*diff(y,2)+C(2)*diff(y,1)+C(3)*y -F;
LDEq = laplace(DEq);
LDEq1 = subs(LDEq,{laplace(y(t),t,s),y(0),subs(diff(y(t), t), t, 0)},{Y, IC(1),IC(2)});
Ys = solve(LDEq1,Y);
y = collect(simplify(ilaplace(Ys)));
disp('The solution of the given DE is: ');
disp(char(y))
fplot(y)
title('Plot of the Solution')
  2 个评论
KSSV
KSSV 2021-6-21
Read the respective function's documentation you will get it.
Walter Roberson
Walter Roberson 2021-6-21
I have a personal policy not to give explanation of the code in situations such as this.
When someone asks to have ever line explained, but does not give any specific questions or discuss the concepts involved, then we as volunteers have to assume that the person doing the asking might not have any computing experience at all, and might not have even know things like "positional notation"... let alone have any experience with the topic (such as differential equations.)

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回答（2 个）

Divija Aleti
Divija Aleti 2021-6-24
Hi Surendra,
As KSSV mentioned, do read the documentation of each function used in the code. It will be self-explanatory.
I am listing the links below, for your convenience:
syms
input
diff
laplace
subs
solve
ilaplace
simplify
collect
disp
char
fplot
title
Hope this helps!
Regards,
Divija
Image Analyst
Image Analyst 2021-6-24
编辑：Image Analyst 2021-6-24
Since you didn't write it yourself, I'd contact the author and ask them why they wrote such poor code with no comments and variable names that are not descriptive at all. It's an alphabet soup mess of a program. Ask the author to write like a professional programmer and correct it so that it's virtually self-documenting. It's their fault, not yours, and they should fix it. I train our programmers not to write bad code like that.
See Loren's blog
https://blogs.mathworks.com/loren/2014/01/29/coding-best-practices-a-good-read/

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