How do I save outputs to a vector from if statement

MEI=[]

for node=0:dx:L; 
if node>=0 && node<a
    moment=@(x) (RA*x)
    MEI=moment(node)
elseif node>=a && node<b
    moment=@(x) (RA*x)-(Pa*(x-a))
    MEI=moment(node)

elseif node>=b && node<=L
    moment=@(x) (RA*x)-(Pa*(x-a))-(Pb*(x-b))
    MEI=moment(node)

end

end

I want to save the outputs from the calculations to a 1 column vector. I can only save the last calculated value.

Answer 1

[Walter Roberson]

MEI(end+1) = moment(node)

[Greg]

Thank you very much. Can you explain the logic behind that answer.

[Walter Roberson]

MEI(end) refers to the last element of MEI. MEI(end+1) refers to the location after the last element. Assigning to MEI(end+1) grows MEI to be large enough to fit the new value and then assigns the new value to the location.

Note that your conditions do not always assign a result. If they did always assign a result, it would be more efficient to assign a different approach.