ratios

ratios(X)

X is a vector or a matrix.

If X is a vector, return X(n)\X(n-1) by scanning X. The first element of the result is always NULL.

If X is a matrix, conduct the aforementioned calculation within each column of X. The result is a matrix with the same shape as X.

x=3 12 0 -5 32;
ratios x;
// output
[,4,0,,-6.4]

x=2 3 6 NULL 28 7;
ratios x;
// output
[,1.5,2,,,0.25]

m=matrix(100 105 109 112 108 116, 200 212 208 199 206 210);
m;

ratios(m);