# [R] Problem on Matrix multiplication

From: Arun Kumar Saha <arun.kumar.saha_at_gmail.com>
Date: Thu 15 Jun 2006 - 16:10:10 EST

Dear all r-users,

I am getting a big problem with matrix multiplication

suppose I have,

> weight

Weight

1       1067640
2       8871500
3      42948778
4     127583735
5      22000000
6      44000000
7      56850000
8      23805662

and,
> s

a          b          c          d          e
f          g          h

a 402493.18 -133931.62 461483.3 -94042.86 674493.8 -1493713.2 - 714081.5 -1320551.6
b -133931.62 192766.63 -414674.4 -36700.74 -276595.3 798034.6 382661.6 883478.4
c 461483.25 -414674.43 1618660.4 660949.18 988526.5 -2795048.7 - 1483334.1 -1761234.9
d -94042.86 -36700.74 660949.2 1053310.43 -300291.4 -98814.9 - 263716.7 1130451.3
e 674493.80 -276595.33 988526.5 -300291.35 3090869.8 -3017747.3 - 1766040.6 -2295605.0
f -1493713.19 798034.60 -2795048.7 -98814.90 -3017747.3 10558734.1 4415620.8 6200897.7
g -714081.51 382661.62 -1483334.1 -263716.67 -1766040.6 4415620.8 2593947.5 2341455.0
h -1320551.58 883478.39 -1761234.9 1130451.26 -2295605.0 6200897.7 2341455.0 7756557.3

But when I want to get [transpose(weight)][s][weight] using following syntax,

t(weight)%*%s%*%weight

I got error:

Error in t(weight) %*% s %*% weight : requires numeric matrix/vector arguments

Can anyone please tell me that where my error is?

Thanks and regards,

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