Undefined variable "numel" or class "numel"

Question

Talent Mukaro 2020-6-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549072-undefined-variable-numel-or-class-numel

评论： Talent Mukaro 2020-6-16

Hie, how can i solve the above error in this code as below;

repelem = {};
for ii = 1:numel{subset}
	subsetLabels{ii} = repelem{{subset{ii}.Description},subset{ii}.Count,1};
end
subsetLabels = vertcat(subsetLabels{:});
%nume1 = {};
togglefig('Sample Images',1)
[hpos,hdim] = distributeObjects(numel(subset),0.05,0.95,0.01);
[vpos,vdim] = distributeObjects(3,0.95,0.05,0.025);
ax = gobjects(numel(subset),1);
[hind,vind] = meshgrid(1:numel(imgSet),1:subset(1).Count);
for ii = 1:numel(subsetNames)
	ax(ii) = axes('Units','Normalized',...
        'Position',...
        [hpos(hind(ii)) vpos(vind(ii)) hdim vdim]);
    imshow(subsetNames{ii});
	title(subsetLabels{ii},'fontsize',12)
end
expandAxes(ax);

2 个评论
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Gautam 2020-6-16

for ii = 1:numel{subset} ------------------>>> change the bracket i.e numel(subset)

Talent Mukaro 2020-6-16

thank you Sir. that error resolved. Here is another error;

repelem = {};

for ii = 1:numel(subset)

subsetLabels{ii} = repelem{{subset(ii).Description},subset(ii).Count,1};

end

subsetLabels = vertcat(subsetLabels{:});

The error is;

Matrix indices must be full double.

Error in SignLive (line 19)

subsetLabels{ii} = repelem{{subset(ii).Description},subset(ii).Count,1};

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Answer 1

madhan ravi 2020-6-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549072-undefined-variable-numel-or-class-numel#answer_451839

numel(subset)

1 个评论
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Talent Mukaro 2020-6-16

thank you Sir. that error resolved. Here is another error;

repelem = {};

for ii = 1:numel(subset)

subsetLabels{ii} = repelem{{subset(ii).Description},subset(ii).Count,1};

end

subsetLabels = vertcat(subsetLabels{:});

The error is;

Matrix indices must be full double.

Error in SignLive (line 19)

subsetLabels{ii} = repelem{{subset(ii).Description},subset(ii).Count,1};

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Answer 2

Walter Roberson 2020-6-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549072-undefined-variable-numel-or-class-numel#answer_451845

在 MATLAB Online 中打开

for ii = 1:numel{subset}

That requests that a variable named numel is indexed as a cell array, at offset subset

subsetLabels{ii} = repelem{{subset{ii}.Description},subset{ii}.Count,1};

That requests that a variable named repelem be indexed as a cell.

In MATLAB, the {} operators are used for creating cell arrays, and for indexing "inside" cell arrays, string objects, table objects, and a few other kinds of object.

ax = gobjects(numel(subset),1);

That requests that the numel function be executed on the content of the variable subset . That looks quite reasonable to do.

A function name with () after it indicates invoking a function.

An array with () after it indicates indexing into the array. This is the same () appearance as for functions being invoked, so they can be confused at first glance.

This line of code asks to invoke numel on subset, and then it takes the result of that and takes the constant 1, and uses them as parameters to invoke the gobjects function.

numel{subset}

Not likely to work. You probably do not have a variable named numel to index into. More likely is that you want to invoke numel function on subset, just like you did on constructing ax