# How to compare two variables data by using ifelse? if both variable contain same number and length of data, so condition becomes true it should perform desired functionality.

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taimour sadiq on 19 Oct 2020
Edited: Ameer Hamza on 19 Oct 2020
i want to establish a logic that if variable data is same as variable data "a" or "b'' or "c" or "d"then it should perform the listed functionality
i was trying the below code to get second elseif true and answer "Value==2" but when it first compare if data == a... it gives error >>>Matrix Dimension Must Agree"
a = -6:6;
b = -3:3;
c = 0:6;
d = 0:12;
% data = [-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6] % user selected
data = [-3 -2 -1 0 1 2 3] % For this Data condition "Value = 2" should be answer
% data = [0 1 2 3 4 5 6]
% data = [0 1 2 3 4 5 6 7 8 9 10 11 12]
if data == a
value =1
elseif data == b
value = 2
elseif data == c
value = 3
elseif data == d
value = 4
end
it is giving error that "Matrix Dimesions Must Agree"
##### 2 CommentsShowHide 1 older comment
taimour sadiq on 19 Oct 2020
i apalojize i edited my question.. can u please review...
i want that variable "data" should b compared with variable a,b,c,d and see which comparison satisfy the condition

KSSV on 19 Oct 2020
a = -6:6;
b = -3:3;
c = 0:6;
d = 0:12;
% data = [-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6] % user selected
data = [-3 -2 -1 0 1 2 3] % For this Data condition "Value = 2" should be answer
% data = [0 1 2 3 4 5 6]
% data = [0 1 2 3 4 5 6 7 8 9 10 11 12]
if isequal(data,a)
value =1
elseif isequal(data,b)
value = 2
elseif isequal(data,c)
value = 3
elseif isequal(data,d)
value = 4
end
But what you are trying to do.....what you are doing is not fine.

Ameer Hamza on 19 Oct 2020
Edited: Ameer Hamza on 19 Oct 2020
data and a,b,c,d have different dimensions. Use isequal()
if isequal(data, a)
value =1
elseif isequal(data, b)
value = 2
elseif isequal(data, c)
value = 3
elseif isequal(data, d)
value = 4
end
Or the following more general approach
a = -6:6;
b = -3:3;
c = 0:6;
d = 0:12;
data = [-3 -2 -1 0 1 2 3]; % For this Data condition "Value = 2" should be answer
C = {a, b, c, d};
value = find(cellfun(@(x) isequal(data, x), C));