| Math {spam} | R Documentation |
Applies the Math group functions to 'spam' objects
# ceiling(x) # floor(x) # exp(x, base = exp(1)) # log(x, base = exp(1)) # sqrt(x) # abs(x) # cumprod(x) # cumsum(x) # cos(x) # sin(x) # tan(x) # acosh(x) ...
x |
spam object. |
base |
positive number. The base with respect to which logarithms
are computed. Defaults to e=exp(1). |
It is important to note that the zero entries do not enter the evaluation. The operations are performed on the stored non-zero elements. This may lead to differences if compared with the same operation on a full matrix. For example, the cosine of sparse matrix is a (full) matrix with many ones.
Evaluating function resulting in NA/NaN/Inf is possible but the result
cannot be used further as NA/NaN/Inf are not meaningful (yet).
All functions operate on the vector x@entries and return the
result thereof.
Reinhard Furrer
getGroupMembers("Math")
mat <- matrix(c( 1,2,0,3,0,0,0,4,5),3)
smat <- as.spam( mat)
cos( mat)
cos( smat)
sqrt( smat)