simple matrix process for some values

hi im new to matlab

i want to process some of the matrix values but not all

like if i have a matrix i just want to add 10 to any value thats less than 5

its just an example can you help me with basic commands on this?

thank you

Answer 1

[Star Strider]

Use ‘logical indexing’:

M = randi(10,6)
Mnew = M+(M<5)*10

producing (in this random instance):

M =
     8     6     5     2     1     2
     9     4    10     6     3     1
     2     2     2     3     1     4
     2     3     8     2     5     5
     4    10     8     3     1     2
     1     7     6     9     9    10

Mnew =

     8     6     5    12    11    12
     9    14    10     6    13    11
    12    12    12    13    11    14
    12    13     8    12     5     5
    14    10     8    13    11    12
    11     7     6     9     9    10

See the documentation section on Matrix Indexing for details.