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Size function - Dimensions of matrix:
For the matrix mat shown next, it has three rows and two columns, therefore the size is 3 × 2. The length is the larger dimension that is 3.
>> mat = [1:3; 5:7]'
mat =
1 5
2 6
3 7
>> size(mat)
ans =
3 2
>> length(mat)
3
>> [r c] = size(mat)
r = 3
c = 2
The size function returns two values; therefore in order to capture these values in separate variables we put a vector of two variables on the left of the assignment. The variable r stores the initial value returned, that is the number of rows, and c stores the number of columns.
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use the loop for to produce [-1 -1 -1 -1; 0 -1 -1 -1; 0 0 -1 -1; 0 0 0 -1]
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