plot the graph of mulivariable

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shiv gaur
shiv gaur 2022-1-13
编辑： Walter Roberson 2025-2-26，4:53
Ran in:
theta = linspace(0,2*pi,100);
na= linspace(1,20,100);
da= linspace(0,5,100);
figure(1)
[x,y]=f(theta,na,da);
dx = gradient(x);
dy = gradient(y);
dna=gradient(na);
p=dy./dx/dy./dna;
plot(da,p);
Warning: Imaginary parts of complex X and/or Y arguments ignored.
%%%%%%%%%%%%%%%%%%%
function [x,y]=f(theta,na,da)
np=1.5;
a=1.2;
b=3;
x=np*sin(theta);
k1=sqrt(a-x.^2)+na;
k2=sqrt(b-x.^2);
y=(k1-k2)./(k1+k2)+da;
end
pl help to plot graph between da vs p=dy/dx/dy/dna
  2 个评论
shiv gaur
shiv gaur 2022-1-13
pl help to plot graph between da vs p=dy/dx/dy/dna
Benjamin Thompson
Benjamin Thompson 2022-1-28
y and dy have complex values due to x being to large. Can you change the definition of your problem?

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回答（1 个）

Vedant
Vedant 2025-2-26，4:08
Hi @shiv gaur,
Upon reviewing your code, I noticed that the expression for p should be written as
p = (dy ./ dx) ./ (dy ./ dna) 
instead of
p = dy./dx/dy./dna
This ensures the correct order of division and prevents ambiguous results.
Also, as the “p” will contain both real and imaginary parts so create the plot of them as below:
figure;
subplot(2, 1, 1);
plot(da, real(p));
xlabel('da');
ylabel('Real part of p');
title('Real Part of da vs p');
grid on;
subplot(2, 1, 2);
plot(da, imag(p));
xlabel('da');
ylabel('Imaginary part of p');
title('Imaginary Part of da vs p');
grid on;
After implementing the changes, the final result of plotting this graph is as follows:

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