CODEWITHSUNDEEP
matlabgraphics
xyz
xyz

Reputation: 413

An issue about the ezplot of MATLAB

I use the MATLAB built-in ezplot to draw the graph of a parametric equation. For instance,

ezplot('sin(t)+2*cos(t)','3*sin(t)+cos(t)',[0,2*pi])

enter image description here

Now, I replace this expression with the following code:

a=1;
b=2;
c=3;
ezplot('a*sin(t)+b*cos(t)','c*sin(t)+cos(t)',[0,2*pi])

enter image description here

I don't kown how to deal with this case?

Upvotes: 3

Views: 209

Answers (2)

Daniel
Daniel

Reputation: 36720

Instead of passing strings, pass a function handle. In this case a,b and c will be evaluated:

a=1;
b=2;
c=3;
ezplot(@(t)a*sin(t)+b*cos(t),@(t)c*sin(t)+cos(t),[0,2*pi])

Upvotes: 4

Ander Biguri
Ander Biguri

Reputation: 35525

that is because MATLAB does not now that the 'a' in the string you defined is the variable called a.

My recommendation: if you want to go changing the equations, change it using string replacement tenciques, or string concatenation techniques.

e.g. ezplot([num2str(a), '+', num2str(b),'*cos(t)'],......)

Upvotes: 5

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