how to create 3*5 matrix using loop?

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anjala rai
anjala rai 2016-10-16
回答： Walter Roberson 2016-10-16
11) Create a 3 x 5 matrix. Perform each of the following using loops (with if statements if necessary): • Find the maximum value in each column. • Find the maximum value in each row. • Find the maximum value in the entire matrix.
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dpb
dpb 2016-10-16
But I'll note the question doesn't match the HW question -- it doesn't say use a loop to create the array, only for the computation of the various maxima.

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回答（2 个）

Austin
Austin 2016-10-16
Where did you become stuck?
The MATLAB Onramp explains creating matricides pretty well. Max function help is here: https://www.mathworks.com/help/matlab/ref/max.html
I thought the hardest part was figuring out what to loop. If you just start typing it in, the repeating commands are easier to identify.
Here is how to find the max of each row with a loop by indexing into each row of the created array:
a=rand(3,5)%There are a bunch of ways to put in better data; try MATLAB Onramp tutorial
b=zeros(1:3);%pre allocating for the row answer
for n=1:3
b(n)=max(a(n,:))%This returns the max of each row as an element of b.
end
Walter Roberson
Walter Roberson 2016-10-16
You can get the outline of the code from http://www.mathworks.com/matlabcentral/answers/307479-how-to-use-if-statement-to-pick-up-3-to-4-values-from-the-data-that-nearest-to-the-mean#answer_239173 which is code that finds the 4 smallest values of something.

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