error occuring

if (N_red = 3) & (difference_red<0.1)

    unlike_red = 0.5

??? if (N_red = 3) & (difference_red<0.1) | Error: The expression to the left of the equals sign is not a valid target for an assignment.

can anyone suggest it plsss as soon as possible

[Jan]

"plsss as soon as possible" is not helpful in this forum. It does not sound polite, but pushy. In addition there is a high correlation between the appearence of "plzzz" and the "no_attempt" and "doit4me" tag, which are both desasterous.

If you want to be polite, accept an answer which solves the problem and thank the auther in the comment section. Just as a suggestion.

Answer 1

[Grzegorz Knor]

Should be:

if (N_red == 3) & (difference_red<0.1)

[Image Analyst]

I'd probably use && instead of &.

[Jan]

And my MLint has copied IA's recommendation also.

[Grzegorz Knor]

You are right.

Answer 2

[Jan]

Description of the problem:

N_red = 3

This assigns the value 3 to the variable N_red. But in an IF-condition you want to compare, such that the == operator is required.