putting specific values in an array to zero

I have an array of numbers

BIM2=

   0      0      0      0      0    671      0      0      0      0      0    866      0      0      0      0      0    842      0      0
        0      0      0      0      0    574      0      0      0      0      0    671      0      0      0      0      0    671      0      0
        0      0      0      0   1147    622      0      0      0      0   1001    818    866      0      0      0   1208    671      0      0
        0      0    598    793      0      0      0    671    659    866      0      0      0      0    488    866      0      0      0      0
        0      0    610      0      0      0      0      0    439      0      0      0      0      0    683      0      0      0      0      0
        0      0    647      0      0      0      0      0   1025      0      0      0      0      0    805      0      0      0      0      0
        0      0    903      0      0      0      0      0    781      0      0      0      0      0    683      0      0      0      0      0
        0      0    671    732      0      0      0    927    647    952      0      0      0      0    903    915      0      0      0    915
     1184    732    647    598    732    818      0      0      0      0    891    683   1159    720    513    635   1025    647    879    866
        0      0      0      0    452    586      0      0      0      0      0    683      0      0      0      0      0    732      0      0
        0      0      0      0    110    793      0      0      0      0      0    830      0      0      0      0      0    720      0      0
        0      0      0      0    244    732      0      0      0      0      0    854      0      0      0      0      0    866      0      0
        0      0      0      0    940    781      0      0      0      0    757    561    879      0      0      0    866    671      0      0
        0      0      0      0   1013    513    696    854    586   1196   1196    610    830      0      0      0   1123    549    769    940
        0      0    561      0      0      0      0      0    439      0      0      0      0      0    598      0      0      0      0      0
        0      0    622      0      0      0      0      0    659      0      0      0      0      0    757      0      0      0      0      0
        0      0    818      0      0      0      0      0    732      0      0      0      0      0    708      0      0      0      0      0
        0      0    525      0      0      0      0      0    574      0      0      0      0      0    574      0      0      0      0      0
     1354   1001    708   1074      0      0      0   1098    659   1025      0      0      0   1037    720    988    586    488   1013   1281
      696    757   1977    488    744    635    647    879   2038    403    635    415    757    793   1903    574    757    427    744    830

and a list of the top 10% highest values

VsortN =
   1074
   1098
   1123
   1147
   1159
   1184
   1196
   1196
   1208
   1281
   1354
   1903
   1977
   2038

I now want to put all of these values to zero, I have tried:

BIM2=BIM2(BIM2==VsortN)==0 ;

But this doesn't work

Answer 1

[Geoff Hayes]

Jason - when comparing

 BIM2==VsortN

are you observing an error along the lines of

 Error using  == 
 Matrix dimensions must agree.

This error makes sense because the code is trying to compare two matrices of different dimensions. You could try using ismember instead as

 BIM2(ismember(BIM2,VsortN)) = 0;

where ismember returns a logical array of ones and zeros indicating whether the element of BIM2 is a member of VsortN or isn't respectively.

There may be more efficient ways to do the above so be wary if using large matrices.

[Jason]

Thankyou