how to REPLACE VALUES in a dataframe

indx <- match(u$nam, v$enter, nomatch = 0)
u$coe[indx != 0] <- v$coeff[indx]

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Hi,

I have two data frames (u and v).

u
  coe      nam
1   0     Time
2   0    Poten
3   0   AdvExp
4   0    Share
5   0   Change
6   0 Accounts
7   0     Work
8   0   Rating

v
      coeff    enter
1 0.7272727 Accounts
2 0.3211112     Time
3 0.0500123    Poten

I want to update the values of coe in u by using the values ofcoeff in v.
That is, I want to get the following result

u
  coe                   nam
1   0.3211112     Time
2   0.0500123    Poten
3   0                   AdvExp
4   0                   Share
5   0                   Change
6    0.7272727   Accounts
7   0                   Work
8   0                   Rating

OR the following result is also acceptable:

0.3211112    0.0500123    0    0    0     0.7272727    0    0

I tried the following, but the result is not right.
replace(coe,colnames,coeff)
[1] 0.7272727 0.0500123 0.3211112 0.0000000 0.0000000 0.0000000 0.0000000
[8] 0.0000000

PLEASE HELP ME. 

THANK YOU VERY MUCH.

~valerie
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how to REPLACE VALUES in a dataframe

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