ismember and if not working

Question

Khairul Nur 2021-7-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/883589-ismember-and-if-not-working

评论： Khairul Nur 2021-7-22

hi, basically i want to check whether the array "A" contains specific value or not (0,2 and 3), if the array lack of specific value, i would like to add into the array and do some counting. Here is my code. Not error but i didnt into the elseif condition.

The specific value are stored in array_include_exclude array.

Hope my explainantion is clear. Please help to solve this. TQIA

array_include_exclude=[0 2 3]'
array_include_only=[0 2]'
array_exclude_only=[0 3]'
A=[0 2]'
count1=0
count2=0
count3=0
if A ismember(array_include_exclude)
   count1=count1+1
elseif A ismember(array_include_only)
    A=[A 3]
    count2=count2+1
elseif A ismember(array_exclude_only)
    A=[A 2]
    count3=count3+1
end

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Answer 1

Simon Chan 2021-7-22

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在 MATLAB Online 中打开

Please refer to the usage of ismember below, so location of variable A is not correct,

On the other hand, rearrange the order otherwise the first condition always satisfy and exit the loop.

Syntax

Lia = ismember(A,B)

Lia = ismember(A,B,'rows')

if ismember(A,array_include_only)
    A=[A; 3]                                    % Modify to become a column matrix
    count2=count2+1
elseif ismember(A,array_exclude_only)
    A=[A; 2]
    count3=count3+1
elseif ismember(A,array_include_exclude)
    count1=count1+1
end

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Khairul Nur 2021-7-22

在 MATLAB Online 中打开

the code has some error on the array dimension and i edit it and working. Thanks Simon!

array_include_exclude=[0 2 3]
array_include_only=[0 2]
array_exclude_only=[0 3]
A=[0 2]
count1=0
count2=0
count3=0
if ismember(A,array_include_only)
    A=[A 3]                                  % Modify to become a column matrix
    count2=count2+1
elseif ismember(A,array_exclude_only)
    A=[A 2]
    count3=count3+1
elseif ismember(A,array_include_exclude)
    count1=count1+1
end