What is wrong with A = alter(a)?

N = 500;
A = zeros(N);

A(20:50, 75:100) = 6;
for i = 1:10
    A = alter(A);
    figure(1);
    imagesc(A);
    pause
end

When I run this, it shows me an error Undefined function or variable 'alter'.

Answer 1

[Steven Lord]

which -all alter

'alter' not found.

What function are you trying to call?

From the tag can I assume you're trying to use Computer Vision Toolbox? Looking at the list of functions in that toolbox I don't see one named alter.

[Walter Roberson]

I searched all of the .m files for all of the toolboxes that I have (I have most but not all). I was not able to find any function named alter or any class method named alter

Answer 2

[yanqi liu]

clc; clear all; close all;

N = 500;
A = zeros(N);

A(20:50, 75:100) = 6;
for i = 1
    A = alter(A);
    figure(1);
    imagesc(A);
    %pause
end

function A=alter(A)
A = imadjust(A);
end