FSOLVE with For loop

Hello , i need your help

i have the function F(x,b) = x.^3.*b+exp(-b.^2)+x.*b - 500

I have to make a plot(x,b)

x is constant and takes values from 0 to 30

I have to use fsolve and for loop to solve this but i dont know exactly how to do it

please help

Answer 1

[David Hill]

Not sure what values you what for b, but you will not to do a surf plot or plot3 (3d plot)

f=@(x,b)x.^3.*b+exp(-b.^2)+x.*b-500;
[x,b]=meshgrid(0:30,-2:.1:2);
surf(x,b,f(x,b));

[Kon Syro]

x is constant and takes values from 0 to 30.

I have to solve this non linear equation with fsolve and for every b from 0 to 30 (with step 1) find the counterpart b ,and then create the 2d plot(x,b)

Have you any idea ?

thanx

[David Hill]

Your description is not clear at all. After your comment, I assume you want to find the root (zero-crossing) of the non-linear equation. Of course, there is no solution at b=0.

for b=1:30
    X(b)=fzero(@(x)x.^3.*b+exp(-b.^2)+x.*b-500,1);
end
plot(1:30,X);