case of two mappings

Hi everyone! I am having difficulty in the combination of the two mappings, I have tried many times but still have not found a way to build the program. hope everyone help me. thank you very much.

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

What do you mean exactly by mappings? Please provide a small example input and output to illustrate what you mean. And what have you tried so far?

Answer 1

[Walter Roberson]

%mapping #1: x -> x^2
%mapping #2: x -> x/2 + 1

mapping1 = @(x) x.^2;
mapping2 = @(x) x/2 + 1;

map1_2 = @(x) mapping2(mapping1(x));
fplot(map1_2, [-5 5])

Answer 2

[hang dong]

mapping1: permutation [0 1 3 2]

mapping2: permutation [0 3 2 1]

The combination of these two mappings will be a permutation I know how to calculate it on writing paper, I have trouble doing it on matlab

Answer 3

[James Tursa]

Not sure which one is first, but maybe one of these is what you want?

>> mapping1 = [0 1 3 2]
mapping1 =
     0     1     3     2
>> mapping2 = [0 3 2 1]
mapping2 =
     0     3     2     1
>> mapping1(mapping2+1)
ans =
     0     2     3     1
>> mapping2(mapping1+1)
ans =
     0     3     1     2

[hang dong]

thank you very much!