Divide a scalar by all non-zero values in a matrix row and input results into a new matrix

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Robert Demyanovich 2022-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/1621645-divide-a-scalar-by-all-non-zero-values-in-a-matrix-row-and-input-results-into-a-new-matrix

评论： dpb 2022-1-3

I have a matrix cA. I want to input values into a matrix A that are a scalar (1E-14) divided by each element in a row of cA that is not equal to zero.

I have so far:

A = (1E-14)./cA(i,:);

but this uses every column in the ith row. Some of the cell values in the columns are zero so the result is infinity in some cells/elements of A. I would only like to input a value into an element of A if cA(i,j) > 0. Alternatively, if the result is infinity, then just input a zero into that element of A.

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Meg Noah 2022-1-3

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Another Trick:

verySmallNumber = 1.0e-32;
denom = cA;
denom(abs(denom) < verySmallNumber & denom > 0) = verySmallNumber;
denom(abs(denom) < verySmallNumber & denom < 0) = -verySmallNumber;
A=MAGICCONSTANT./denom;