[R] Stop R from changing matrix to numeric

Sachinthaka Abeywardana sachin.abeywardana at gmail.com
Wed Dec 17 07:55:27 CET 2014

I have the following cost function:

If I send in a matrix which has MORE than one row and 2 columns, this
works fine. However, if I try to do cost(t(as.matrix(c(1,1)))) it
gives me an index error. When I tried debugging it, I found that the
type of matrix 'x' was converted to numeric.

How do I prevent this conversion from matrix to numeric if its a
matrix with just one row? The only way it would work is if I have:
x[1]*sin(4*x[1])+1.1*x[2]*sin(2*x[2]), which in turn wont work with a
matrix input.


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