anyone can help me explain the meaning of the following code?

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Shwe 2024-5-6

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评论： Shwe 2024-5-6

data = [ 1 100 500; 2 200 600; 3 300 700; 4 400 800 ];
headers = {'ID', 'Population', 'Revenue'}; 
for i = 1:size(data, 1)
    fprintf('%-4d %-12d %-10d\n', data(i, :));
end
1    100          500       
2    200          600       
3    300          700       
4    400          800       

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Torsten 2024-5-6

编辑：Torsten 2024-5-6

It defines a loop over i where i runs from 1 to the number of rows of the matrix "data" (the "1" in size(data,1) refers to the first dimension of the matrix "data", thus the number of rows).

Since "data" has 4 rows, the loop runs from 1 to 4.

Shwe 2024-5-6

'It defines a loop over i where i runs from 1 to the number of rows of the matrix "data" (the "1" in size(data,1) refers to the first dimension of the matrix "data", thus the number of rows).

Since "data" has 4 rows, the loop runs from 1 to 4.'

Dear Torsten,

Thank you for your explaination.

regards,

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Answer 1

the cyclist 2024-5-6

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编辑：the cyclist 2024-5-6

在 MATLAB Online 中打开

I ran your code here. It seems pretty obvious what it does, right?

You might want to do the free online MATLAB Onramp tutorial, if you don't know what a for loop does. You could also read the documentation page for fprintf.

Perhaps the only tricky part is the exact explanation of the formatting strings such as

'%-4d'

That is explained in that documentation page, in the formatSpec section.