how to optimise the code with cell?

Question

Shubham Mohan Tatpalliwar 2019-2-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444491-how-to-optimise-the-code-with-cell

评论： Shubham Mohan Tatpalliwar 2019-2-12

for this program i am calculating A by using for

A = cell(1,3);
for k = 1:3
    A{k} =  B*k + C*k;
end

And then every matrix is to be compared to get a Optimal matrix containg minimum of every every A matrix

Comparison = cat(3,A{1},A{2},A{3});
MinimumMatrix = min(Comparison./(Comparison~=0),[],3);

This is a example code

Nut in actual program i have to calculate

k=1000:10:5500

What function should be used in

Comparison = cat(3,A{1000},A{1010},.. A{5500});

to avoid writing the name of each variable for comparison matrix

2 个评论
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madhan ravi 2019-2-12

在 MATLAB Online 中打开

cellfun(@(x)min(x),A,'un',0)

madhan ravi 2019-2-12

oops I misinterpreted please upload cell A as .mat file

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Answer 1

Guillaume 2019-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/444491-how-to-optimise-the-code-with-cell#answer_360642

在 MATLAB Online 中打开

Why are you using cell arrays in the first place? It's just slower and has more overhead than matrices. You can just create your final matrix directly

stepcount = 3
A = zeros([size(B), stepcount]);
for k = 1:stepcount
    A(:, :, k) = B*k + C*k;
end

If you really want to use an intermediate cell array, then you can use the expansion of cell arrays into comma-separated lists:

Comparison = cat(3,A{1},A{2},A{3});
%is equivalent to
Comparison = cat(3,A{:});
Comparison = cat(3,A{1000},A{1010},..  A{5500});
%is equivalent to
Comparison = cat(3,A{1000:5500});