CODEWITHSUNDEEP
matlab
user2942448
user2942448

Reputation: 29

How can I plot a symbolic function in Matlab

a=2;
b=9;  %the variance    
syms x 
i0=besseli(0,a*x/b);
fx=(x/b)*exp(-(x^2+a^2)/(2*b))*i0;
fun=matlabFunction(x*fx);
mean=quad(fun,0,282);

How can I plot fx and the integral of fx?

Upvotes: 2

Views: 247

Answers (3)

Simon
Simon

Reputation: 32873

To plot, you can do

xx = 0:.1:10;
fxx = matlabFunction(fx);
plot(xx, fxx(xx))

or

fxx = matlabFunction(fx);
fplot(fxx, [0 10])

And for the integral, one solution is:

fxx = matlabFunction(fx);
ifxx = @(x) integral(fxx,0,x);
fplot(ifxx, [0 10])

This is to get you going. I hope there will better answers.

Upvotes: 2

Bob Gilmore
Bob Gilmore

Reputation: 13758

There's a suite of "ez" ("easy") plot functions to handle this. ezplot, ezsurf, ezmesh, and so on...

See http://www.mathworks.com/help/symbolic/plot-functions-and-data.html for more information on the plotting functions supplied with the Symbolic Math Toolbox.

Upvotes: 0

MJay
MJay

Reputation: 1058

Try using function "subs". That sound to be like this:

for i = Xstart:Xend
   y(i) = subs(f,x,i);
end

plot(Xstart:Xend,y)

I hope I could helped.

Upvotes: 0

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