[R] compute values by condition in DF by rownames

[JS Huang]

Hi,

  I hope that someone can provide a better way to implement it.  This is my
implementation.

> data
              X2     gbm_tcga   lusc_tcga ucec_tcga_pub
1       gbm_tcga  1.000000000  0.14053719  -0.102847164
2       gbm_tcga  1.000000000  0.04413434   0.013568055
3       gbm_tcga  1.000000000 -0.20003971   0.038971817
4       gbm_tcga  1.000000000  0.14569916   0.009947045
5      lusc_tcga  0.140537191  1.00000000   0.133080708
6      lusc_tcga  0.044134345  1.00000000   0.062024713
7      lusc_tcga -0.200039712  1.00000000  -0.130239551
8      lusc_tcga  0.145699156  1.00000000   0.041796670
9  ucec_tcga_pub -0.102847164  0.13308071   1.000000000
10 ucec_tcga_pub  0.013568055  0.06202471   1.000000000
11 ucec_tcga_pub  0.038971817 -0.13023955   1.000000000
12 ucec_tcga_pub  0.009947045  0.04179667   1.000000000
> test
function(x)
{
  tempMatrix <- matrix(0,nrow=3,ncol=3)
  lev <- levels(x$X2)
  for (i in 1:length(lev))
  {
    tempMatrix[i,1] = sum(ifelse(abs(x[x$X2==lev[i],2])>0.2,1,0))
    tempMatrix[i,2] = sum(ifelse(abs(x[x$X2==lev[i],3])>0.2,1,0))
    tempMatrix[i,3] = sum(ifelse(abs(x[x$X2==lev[i],4])>0.2,1,0))
  }
  result <- data.frame(lev,tempMatrix)
  names(result) <- c("X2","gbm_tcga","lusc_tcga","tcga_pub")
  return(result)
}
> test(data)
             X2 gbm_tcga lusc_tcga tcga_pub
1      gbm_tcga        4         1        0
2     lusc_tcga        1         4        0
3 ucec_tcga_pub        0         0        4
> 



--
View this message in context: http://r.789695.n4.nabble.com/compute-values-by-condition-in-DF-by-rownames-tp4703351p4703374.html
Sent from the R help mailing list archive at Nabble.com.