percentChange

percentChange(X, [n])

X is a vector or matrix.

n (optional) is an integer specifying the step to shift when comparing elements in X. The default value is 1, meaning to compare the current element with the adjacent element at left.

For each element X_i in X, return (X_i / X_i-n) - 1, representing the percentage changes between elements.

Return value: A vector or matrix with the same shape as X.

percentChange([1,2,3]);
// output: [,1,0.5]

percentChange(85 90 95);
// output: [,0.058824,0.055556]

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

percentChange(m);

r = percentChange(1..10,3);
r;
// output: [,,,3,1.5,1,0.75,0.6,0.5,0.43]

m=matrix(1 3 2 NULL 6 9 3, 0 8 NULL 7 6 2 8);
r = percentChange(m,2);
r;

m = 3 4 6 9
r2= percentChange(m,-2)
r2; 
// output: [-0.5,-0.56,,]