How to change value of sub-rectangle in large array

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Alex
Alex 2014-2-19
回答： Walter Roberson 2014-2-19
I have a 1200x1200 array of zeros and I want most of them to be zeros, but I want to insert rectangles (or circles) of 1's at certain positions. For example I want a 20x20 rectangle of 1's starting at position (621,499). Is there an easy way to do this without typing in each cell value?
i.e. I do not want to use A(x,y)=1 for a repetitive amount of times. I know I could use a for loop, but I prefer not to. Please help!

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Walter Roberson
Walter Roberson 2014-2-19
Matrix(621:621+20-1, 499:499+20=1) = 1;

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