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.

Question

taimour sadiq 2020-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/619013-how-to-compare-two-variables-data-by-using-ifelse-if-both-variable-contain-same-number-and-length

编辑： Ameer Hamza 2020-10-19

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"

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Ameer Hamza 2020-10-19

If you only plot when 'b' and 'c' are equal to 'a', then are you trying to plot(a, a).

taimour sadiq 2020-10-19

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

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Answer 1

KSSV 2020-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/619013-how-to-compare-two-variables-data-by-using-ifelse-if-both-variable-contain-same-number-and-length#answer_518223

在 MATLAB Online 中打开

Read about isequal.

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.

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Answer 2

Ameer Hamza 2020-10-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/619013-how-to-compare-two-variables-data-by-using-ifelse-if-both-variable-contain-same-number-and-length#answer_518228

编辑：Ameer Hamza 2020-10-19

在 MATLAB Online 中打开

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));