How to check an array for its content?

Question

Philipp Mueller 2020-5-26

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https://ww2.mathworks.cn/matlabcentral/answers/533913-how-to-check-an-array-for-its-content

编辑： Tommy 2020-5-26

Hello,

I would like to query the contents of my array (the name is loadp - 40 * 1 double) if the value of each cell is not 0 or empty or NaN or whether the value has not already occurred in the previous runs by using the for loop. If this conditions are all true then set hello=1;

Thank you.

for i=1:numRows;
    %tmp = regexp(my_strings(i),'(?<=_l)\d+','match','once');
    loadp(i,1) =  str2double(tmp)/100;% 
    if ~ismember(loadp(i),loadp(1:i-1)) ==1 && loadp(i)~=0 && (isnan(loadp(i,1))~=0 | isempty(loadp(i,1))~=0) 
        hello=1;
    end
end

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Answer 1

Tommy 2020-5-26

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https://ww2.mathworks.cn/matlabcentral/answers/533913-how-to-check-an-array-for-its-content#answer_439218

编辑：Tommy 2020-5-26

在 MATLAB Online 中打开

It sounds like you want to make sure isnan and isempty do return 0. Also, there is no need to explicitly check if the result of each of these operations is equal to true or false, as true==1 is the same as true and false==1 is the same as false.

for i=1:10
    %tmp = regexp(my_strings(i),'(?<=_l)\d+','match','once');
    loadp(i) = randi(10);
    if ~ismember(loadp(i),loadp(1:i-1)) && loadp(i) && ~isnan(loadp(i)) && ~isempty(loadp(i))
        hello=1;
    end
end