How to make a new column in my table

Hi,

I have the following in my table (Results) of 550 rows:

A = audsActual %in the second row

P = audsPreds %in the third row

I want to make a 4th column that checks if for each row, if A = P, then it says 1. if not, it says 0.

I wrote this code but it is not working:

if Results(2,:) == Results(3,:)
        Results (4,:) = 1
    elseif Results (4,:) = 0

It's giving me an error message. Please help, thank you!

Answer 1

[Walter Roberson]

elseif requires a expression after it, but you coded an assignment.

You just want else not elseif

Remember that

if Results(2,:) == Results(3,:)

is going to test all of row 2 against all of row 3, creating a logical vector of true and false. if and while consider a test to be true only if all of the values being tested are non-zero, so the code you wrote is equivalent to

if all(Results(2,:) == Results(3,:))

which is not what you want.

What you really need to do is read about logical indexing. https://blogs.mathworks.com/loren/2013/02/20/logical-indexing-multiple-conditions/

[Walter Roberson]

Though in this particular case you could just code

Results(4,:) = Results(2,:) == Results(3,:);