R矩阵向量比较

Question

I would like to compare column elements of a matrix to a corresponding vector column.

So for example,

>ret

                    TLT          VTI
1995-01-20 -0.005649718 -0.004461441
1995-01-23 -0.002840909  0.002560820
1995-01-24  0.000000000  0.000000000
1995-01-25  0.005698006  0.003831418
1995-01-26  0.000000000  0.001908397


>compare.vec
[1] -0.001  -0.002

What I want is to compare each return element in column 1 of ret to -0.001 and find which one is smaller than -0.001. Vice versa for the second column, comparing it to -0.002 and finding the elements in VTI volumn that are less than that.

I tried subset, but it seems its not for a vector but a number. Will I need to loop column for column?

Thanks,

Answer 1

All you have to do is:

t(t(ret) < compare.vec)

EDIT based on comment from Arun.