Find indices for the minimum positive values in a cell

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EldaEbrithil 2020-6-19

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编辑： EldaEbrithil 2020-6-19

Hi all

i am not able to find the indices for the minimum positive values inside a 2x7 cell. I would find the cell number (containing this minimum element) and its position inside the cell. For example in the first cell the minimum positive value have index [row,column]=[1,2].

This is my 2x7 cell:

C = {[5 0.0001;0 0.1],3,-2,2,3,[-0.1 5],[2 0.0001];[1 2],[0.0001 1],2,4,5,[1 -0.1],6};

Thank you for the help

Regards

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Rik 2020-6-19

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You can always consider cellfun if you want to apply a function to every element of your cell. It might not be the fastest option though.

C = {[5 0.0001;0 0.1],3,-2,2,3,[-0.1 5],[2 0.0001];[1 2],[0.0001 1],2,4,5,[1 -0.1],6};
[rows,cols]=cellfun(@myfun,C);
function [row,col]=myfun(A)
A(A<0)=inf;%make sure it isn't the minimum
[~,idx]=min(A(:));
[row,col]=ind2sub(size(A),idx);
end

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Rik 2020-6-19

If you mean closest to 0, why did you say only positive? And do you want the actual value itself, or the indices, as you originally described?

Since inside the function you're working with a local copy of the array, you can simply use the abs function to remove the sign.

function [row,col]=myfun(A)
A=abs(A);
[~,idx]=min(A(:));
[row,col]=ind2sub(size(A),idx);
end

Please stop changing the requirements. Note that you can run this function as normal:

[row,col]=myfun([-1 -0.1]);

Think long and hard about what it is you want. Only then can you hope to solve this.

EldaEbrithil 2020-6-19

编辑：EldaEbrithil 2020-6-19

Sorry I had not specified very well in the last message. When i introduced the negative cell I wanted to take a step forward, redirecting myself to another goal, that is to find the value closest to zero. Thank you very much for the help

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Suhas Maddi 2020-6-19

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编辑：Suhas Maddi 2020-6-19

Hii Elda,You can use a for loops to go through each element in the cell and find indexes of minimum values for each cell element using the min() function.For more information and detailed examples, You can refer to : https://www.mathworks.com/help/matlab/ref/min.html

%You want to find minimum element and it's index in first Cell element
%M is the minimum value and [x,y] is the index of the minimum value in the cell element.
[M,I]=min(min(C{1,1}));
[x,y]=find(C{1,1}==M)
%To do this for the whole cell,You can use for loops to iterate through each element.

You can also refer to this post : https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix

I hope this helps you.

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Suhas Maddi 2020-6-19

Hii Elda,Yes Kind of in the lines of what you have mentioned.If you want to store the indices of minimum elements for each cell element,You can use a vector or matrix or another cell array Hope this helps.

EldaEbrithil 2020-6-19

ok something like that i suppose:

for i=1:2
    for j=1:7
%You want to find minimum element and it's index in first Cell element
%M is the minimum value and [x,y] is the index of the minimum value in the cell element.
[M(i,j),I]=min(min(C{i,j}));
[x(i,j),y(i,j)]=find(C{i,j}==M(i,j));
%To do this for the whole cell,You can use for loops to iterate through each element.
    end
end