The using of "sum" in a script

Made a small script in which we pick 2 random numeric elements from the "box" (array with "0"s and "1"s). I want to make further steps depending on the sum of these elements, however Matlab doesn't execute the script with the following mistake (see the screenshot). Script proceeds with ">" and "<", but not "="

Answer 1

[Sean de Wolski]

one = is an assignment, two = is a test of equality

if sum(x) == 1

will fix this.

[Vasilyi Troshkin]

thx, did this the 2d time and it worked I tried this before but somehow it didn't help