replacing the value

I have a dataset

gene  samples
1      .6     .1    .8

2       .2    .98   .96

10     0.45    .4   .87 

like these i have 50 rows and 62 columns

there are three conditions

A=(<=.4)

B=>.4 to .87

C=>.87

from these conditions i want to get output as

A=1,2,10(genes)

B=1,10(genes)

C=2(genes)

please help how to process

Answer 1

[Grzegorz Knor]

   samples = [
   .6     .1    .8
   .2    .98   .96
   .45    .4   .87 ];
  genes = [1;2;10];
  %A=(<=.4)
  A = genes(any(samples<=.4,2))
  %B=>.4 to .87
  B = genes(any(samples>=.4 & samples<.87 ,2))
  %C=>.87
  C = genes(any(samples>=.87,2))