If Statement in a table

I have the table K below and would like to use an if statement that replaces the zeros in the fifth column with 300, everytime that the row one below contains a "Ja".

My if statement looks like this:

if K(i,2:5)=="Ja"

K(i-1,6) = 300

end

This is the error I get: Index in position 1 is invalid. Array indices must be positive integers or logical values.

What do I need to change to access the correct data?

Thank you for your help!

Answer 1

[Cris LaPierre]

Have you defined i? If not, it is sqrt(-1).

There error means i is either a decimal or negative number.

A=1:3;
% Works
A(2)

ans = 2

% doesn't work
A(1.5)

Array indices must be positive integers or logical values.

[Noush]

I have now changed my loop to this, and have defined l and m. I now get the error that the use of the operator '=' is not correct, but when I change it to '==' it gives the error that this is not supported for tables. What to do?

[Cris LaPierre]

When indexing a table, paretheses return a table while curly braces return an array. You need to use curly braces to extract the value from the table.

You can read more about accessing data in tables here.

[Noush]

thank you, this fixed my problem :)