Piecewise function. Dont know x

[JAKE WISNIEWSKI]

The first two are the question being asked. Thats the work that I have done so far, but I am confused as to what I should do becuase there is no x value given.

[Walter Roberson]

Duplicate question. You should merge it with your earlier questions on the same topic.

[JAKE WISNIEWSKI]

I deleted the previous question because it seemed like the information provided was not clear enough.

Answer 1

[Walter Roberson]

Establish a vector of definite x values. Use logical indexing

X = something definite 
Y = nan(size(x));
Mask = x > something & x < something else 
Y(Mask) = some vectorized expression in X(Mask)