MATLAB question involving matrices

 Write a MATLAB function that takes a matrix, a row number and a column number. Beginning with the row number passed to the function, scan down the column passed to the function and return the row number that contains the largest absolute value in the column. For example if your matrix is

and you pass row 2, column 2, the function should return 3. Row 3 has the largest absolute value in column 2 including and below row 2.

[Star Strider]

What have you done to code it?

We will help you get your homework code working, but we will not write it for you.

[B Ceng]

Honestly, the question is written in such a confusing manner for me. Anything would help because I do not know where to begin..

[Star Strider]

It’s not confusing really. Start with Matrices and Arrays, then Matrix Indexing to understand it. (You may also need to read about Special Characters to understand how to do element-wise operations.)

Otherwise, search the MATLAB Documentation for the information you want, for instance ‘absolute value’ and ‘loop’ that you will need to do this particular problem.

Part of using any software is to understand how to use the documentation for it.

[B Ceng]

Thank you

[Star Strider]

My pleasure!

I perhaps should have posted this as an answer, but it really isn’t one.

Answer 1

[Image Analyst]

Hint: max() and abs(). That's all you need. You can do it in one line (not including the function declaration line).

[Image Analyst]

Because you have not said it's solved yet, I assume you're still having difficulty. Here's a little bit more:

function rowOfMax = GetRowMaxes(matrix, row, col)
thisColumn = matrix(row:end, col)
[~, rowOfMax] = max(abs(thisColumn)..............
% Add in row offset.
rowOfMax = rowOfMax + ro.................

It's virtually done. A smart engineer like yourself should have no trouble finishing it - it's only a few characters to complete now. Let me know if you can or can't solve it now.