How to convert negative value into positive ????

Hi

I want to convert negative values into positive values in matrix order of any rank.there are some existing techniques to convert negative values into positive are

Taking exponential

Trignometric functions like cos ,sec

Subtracting least values from the highest values

Squaring

Mode

Absolute

Multiplying with negative sign etc

Other than these method i need three different methods to convert negative values into positive .

Thank you

[John D'Errico]

Since we should not be doing your homework for you, this is your problem to solve, not ours.

And there is ABSOLUTELY no reason why you need exactly three other ways to perform such an operation.