Performance Issue detected in Table vs Struct Data

Question

Tobias Poniatowski 2019-2-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/447468-performance-issue-detected-in-table-vs-struct-data

评论： Peter Perkins 2019-3-11

% Hello Mathworks Team,

% our development Team found an issue when writing data into specific positions of a data column of a table.

% Comparing the performance with writing into an array of a struct we was wondering if this is intended or if it could be an issue in the software?

% Could you give us an answer if we should address the data of a table differently?

% Thanks in advance and best Regards.

% Tobias Poniatowski

testData = zeros(100000,1);

testValueToWrite = 4711;

testStruct.data = testData;

testTable = table(testData, 'VariableNames', {'data'});

ticStruct = tic;

for i=1:size(testStruct.data,1)

testStruct.data(i) = testValueToWrite;

end

toc(ticStruct)

ticTable = tic;

for i=1:size(testTable.data,1)

testTable.data(i) = testValueToWrite;

end

toc(ticTable)

% result:

% Elapsed time is 0.025719 seconds.

% Elapsed time is 13.884480 seconds.

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Peter Perkins 2019-3-11

Tobias, as comments in the links that Harshita cites suggest, using vectorized operations is a better strategy. Your code example is so stripped down that it's impossible to give you any real advice, but I imagine that you could contact MathWorks support for help.

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