getting a 90 x 90 matrix

hello. i have a output matrix of 253 x 253. i want a small matrix of 90 x 90. how do i do that. please help.

[dbmn]

More info about the choice of the 90 elements is needed. Please specify (f.ex. interpolation, first / last 90 elements etc)

[Shweta Naiskar]

any 90 elements will do

Answer 1

[Adam]

If you don't care which 90 by 90 elements then

outputMatrix(1:90,1:90)

will do this. As will

outputMatrix(101:190,151:240)

and a whole host of other possibilities.

[Shweta Naiskar]

it is giving me an error for outputMatrix. it says it as an undefined function or variable.

[Stephen23]

@Shweta Naiskar: outputMatrix is the name of your matrix. Use whatever variable name your matrix has.

[Guillaume]

So, if Adam had written code to erase everything on your hard drive, you'd have tried to execute it without trying to understand what it does? Scary thought...

Maybe try to understand what Adam has written. This is very very basic matlab. You should have immediately realised that outputMatrix is to be replaced by whatever name you use for your own matrix.

If you do not understand what Adam answer does, then before progressing any further, you should go through the Getting Started with Matlab tutorial. Chapter 3 on array indexing is of particular interest to you. Again, this is extremely basic matlab that every beginner should understand.

Note: I very much doubt that the answer provided is what you want to do, but since you've provided so little information on what you want, it's equally valid as any other possible answer.