matching with data in cell array

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Rya 2017-6-1

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https://ww2.mathworks.cn/matlabcentral/answers/342833-matching-with-data-in-cell-array

评论： Walter Roberson 2017-7-10

i want to match the output with data in cell array, i want to check whether the number(output) lies in cellarray or not?

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Jan 2017-6-1

@Rya: Andrei asked for a small example. You have posted your complete code with images, documentation, logos, auto-save files, several fig and m-files. What do you expect? That we inspect all of this code only to answer this simple question? The screenshot of the GUI is not useful here also.

You asked for "number(output) lies in cellarray". Then please provide how the number is represented and the typical contents or the cell array. Any further information is a waste of time only.

Rya 2017-6-1

ANPR.mat

the number is stored in variable (noPlate) and output shows in editbox

set(handles.edit1,'string',noPlate);

here is a cell array ('ANPR.mat')

now how to check whether the output no lies in cell array or not

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回答（2 个）

ES 2017-6-1

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342833-matching-with-data-in-cell-array#answer_269177

在 MATLAB Online 中打开

[truefalse, index] = ismember('abc', {'xyz', 'abc', 'def', 'abc'})

This one?

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Walter Roberson 2017-7-10

在 MATLAB Online 中打开

Note that you had

ANPR=['AED632' 'KPT295' 'AKH343' 'AFR420']; %cellarray

That does not create a cell array. You needed

ANPR={'AED632' 'KPT295' 'AKH343' 'AFR420'}; %cellarray

Walter Roberson 2017-7-10

在 MATLAB Online 中打开

The suggested

nnz(ismember('EK94P8',ANPR(:,2)))

should be

nnz(ismember(ANPR(:,2), 'EK94P8'))

When you use ismember(A, B) then for each entry in A, a logical value (true or false) will be returned indicating whether that entry in A was found in B. So if you reverse the order like I show, then for each entry in your second column of ANPR, you are comparing it to the one value 'EK94P8', returning a logical value for each. The number of matches is the same as the number of places the logical value is true, which is the same as the number of places the logical value is non-zero. The number of places that a value is non-zero can be tested with nnz()

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