how can i detect edges

i am trying to find the edges on my image using this code

I = imread('image.tif');

imshow(I)

BW1 = edge(I, 'Canny');

BW2 = edge(I, 'Prewitt');

imshowpair(BW1, BW2, 'montage')

but i get the following error

Execution of script edge as a function is not supported:

/Users/betty/Documents/MATLAB/edge.m

Error in edge (line 3)

BW1 = edge(I, 'Canny');

please help

Answer 1

[DGM]

You have some script labeled 'edge.m' that's overloading the function you're trying to use. Use unique names for files and variables so that doesn't happen.

which edge -all

Will list all instances of edge.m on the path. Rename the one that's causing the conflict (the one in the error message), or remove it from the path.