Matrix Dimensions Must Agree

Okay so I'm very new to matlab, im just trying to create a simple user input unit converter to convert between farenheit, degrees and some metric units. For some reason however I keep getting the error "Matrix dimensions must agree" but only when I add the last elseif statement into the code.

function y = UnitConverter(from, to, inp)

if from == 'deg'
    if to == 'far'
        y = (inp * 9/5) + 32;
    else
        y = 'You cannot convert between these units';
    end


elseif from == 'far'
    if to == 'deg'
        y = (32 - inp) * -5/9;
    else
        y = 'You cannot convert between these units';
    end


elseif from == 'm'
    if to == 'cm'
        y = inp * 100;
    elseif to == 'mm'
        y = inp * 1000;
    end
    
elseif from == 'cm'
    if to == 'mm'
        y = inp * 10;
    elseif to == 'm'
        y = inp / 100;
    end
    
end
end

---------------------------------------------------------

Matrix dimensions must agree.

Error in UnitConverter (line 3)
if from == 'deg'

Answer 1

[madhan ravi]

use strcmp() to compare strings

[Patrick voorhoeve]

That worked, thank you!!! <3