How to Put a Specific Function Inside a For Loop Depending on the Result of an If Statement?

I am currently using something like below. The problem is that for each iteration the if statement is checked and it slows down the execution

function myfun(in1)
for i = 1 : 1000
    for j = 1 : 1000
        if in1 = '1'
            [out2] = myfun2(in2);
        elseif in1 = '2'
            [out3] = myfun3(in3);
        end
    end
end

How can i change it to the following where it once first checks whether it is ‘1’ or ‘2’ and then always put myfun2 or myfun3 in the for loop.

function myfun(in1)
if in1 = '1'
    [out2] = myfun2(in2);
elseif in1 = '2'
    [out3] = myfun3(in3);
end

for i = 1 : 1000
    for j = 1 : 1000
    EXECUTE myfun2 or myfun3, DEPENDING ON THE IF STATEMENT
    end
end

Answer 1

[Jan]

function myfun(in1)
if in1 = '1'
  fcn = @myfun2;
  arg = in2;
else
  fcn = @myfun3;
  arg = in3;
end

for i = 1 : 1000
    for j = 1 : 1000
       out = fcn(arg);
    end
end