MATLAB: I want to find the x and y values of f(x,y) when f(x,y) is a minimum over x = -1:0.001:1 and y = -1:0.001:1.

MATLABminimum

I know how to get min(f). min(x) and min(y) just give -1, not their values when f(x,y) is a minimum. Please help. Thanks

Best Answer

x=-1:0.001:1
y=x
[ii,jj]=ndgrid(x,y]
z=sin(ii)+cos(jj)   % Example
[min_val,index]=min(z)
xidx=x(index)
yidx=y(index)

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MATLAB: Undefined function or variable ‘y’.

Found solution:

a(1,1,x,y,p,N,x_min,x_max,y_min,y_max)
function fun = a(j,i,x,y,p,N,x_min,x_max,y_min,y_max)
f = @(x,y,i,j) p(x,y).* N(i).* N(j);
h = @(y) int(f(x,y,i,j), x, x_min, x_max);
fun = vpa(int(h(y), y, y_min, y_max)); 
end

MATLAB: Graph f(x,y) function

I have no idea what a ‘cloud set’ is, although creating the function (here as an anonymous funciton) is straightforward:

f = @(x,y) -(x-10).^2 -(y-10).^2;
[X,Y] = meshgrid(-10:10);
figure(1)
meshc(X, Y, f(X,Y))
grid on

See the documentation on Function Basics (link) for the details on creating and using functions.

I added the plot for fun, and to demonstrate how to call the function.

Best Answer

Related Solutions

MATLAB: Undefined function or variable ‘y’.

MATLAB: Graph f(x,y) function

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