>>  matrix=[1 2 1 2; 3 4 3 4; 5 6 5 6; 7 8 7 8]
matrix =
     1     2     1     2
     3     4     3     4
     5     6     5     6
     7     8     7     8
>> m1=500+matrix
m1 =
   501   502   501   502
   503   504   503   504
   505   506   505   506
   507   508   507   508
>> m2=500-matrix
m2 =
   499   498   499   498
   497   496   497   496
   495   494   495   494
   493   492   493   492
>> m3=10*matrix
m3 =
    10    20    10    20
    30    40    30    40
    50    60    50    60
    70    80    70    80
>> m4=matrix/4
m4 =
    0.2500    0.5000    0.2500    0.5000
    0.7500    1.0000    0.7500    1.0000
    1.2500    1.5000    1.2500    1.5000
    1.7500    2.0000    1.7500    2.0000
>>