percentChange
Syntax
percentChange(X)
Arguments
X is a vector or a matrix.
Details
If X is a vector, for each element in X, compute the percentage change relative to the previous element. 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.
Examples
$ percentChange([1,2,3]);
[,1,0.5]
$ percentChange(85 90 95);
[,0.058824,0.055556]
$ m=matrix(100 105 109 112 108 116, 200 212 208 199 206 210);
$ m
#0 |
#1 |
|---|---|
100 |
200 |
105 |
212 |
109 |
208 |
112 |
199 |
108 |
206 |
116 |
210 |
$ percentChange(m);
#0 |
#1 |
|---|---|
0.05 |
0.06 |
0.038095238095238 |
-0.018867924528302 |
0.027522935779817 |
-0.043269230769231 |
-0.035714285714286 |
0.035175879396985 |
0.074074074074074 |
0.019417475728155 |