ratios

Syntax

ratios(X)

Arguments

X is a vector or a matrix.

Details

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.

Examples

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

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

$ 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

$ ratios(m);

#0	#1
1.05	1.06
1.038095238095238	0.981132075471698
1.027522935779817	0.956730769230769
0.964285714285714	1.035175879396985
1.074074074074074	1.019417475728155