Skipping elseif when first condition is true

I currently have the following scheme:

if (a =0)
 q = 4
elseif (b=0)
 q = 5
rest of code
end

The problem is, in the case a =0 the program does not work properly, as it simply skips the "rest of code".

I have tried moving the "end" before rest of code, but that does not work for the purposes of this.

Is there a way such that in the case a =0, it sets q=4, then just doesn't consider the elseif (b=0) case and continues onto the rest of the code?

Thanks!

[Stephen23]

"The problem is, in the case a =0 the program does not work properly"

Read the MATLAB documentation to learn what operator to use for logical equivalence:

https://www.mathworks.com/help/matlab/ref/eq.html

And for other logical operators:

https://www.mathworks.com/help/matlab/relational-operators.html

Guessing is not a very efficient way to write code.

Answer 1

[Image Analyst]

That's not how you check if a equals zero. You need to use double equals. A single equals is assignment, NOT comparison. Try this:

if (a == 0)
       q = 4
elseif (b == 0)
       q = 5
        rest of code
end

Answer 2

[Steven Lord]

If you want to execute the rest of the code regardless of whether a was equal to 0 or b was equal to 0, take it out of the if / elseif / end block entirely.

if (a ==0)
 q = 4
elseif (b==0)
 q = 5
end
rest of code

If you need to throw an error if neither a nor b was 0, use else and throw an error inside the else.

if (a ==0)
 q = 4
elseif (b==0)
 q = 5
else
    error('Expected either a or b to be 0')
end
rest of code