working with numbers in the array names in for/ if loop

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Sonali
Sonali 2023-10-22
评论： Dyuman Joshi 2023-10-26
Hi
I am struggling with a program in matlab where I need to make arrays with numbers varying in their name in the loop itself:
For example: given dataset with columns: data_column_1, data_column_2, data_column_3 . . . upto 10
Lets say:
………………………….
For i=1:10
array_(i)= mean(data_column_(i) w.r.t data_column_1 ) %( for all 10 arrays )
end
………………………………..
Solution must be like
array_1 has mean of data in data_column_1 wrt data_column_1
array_2 has mean of data in data_column_2 wrt data_column_1
array_3 has mean of data in data_column_3 wrt data_column_1 and so on.
I will really appreciate some solution here. Thanks

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回答（1 个）

Dyuman Joshi
Dyuman Joshi 2023-10-22
Dynamically naming variables is not a good coding practice.
Read - TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)
As you have numbers only, you should concatenate all the data in a numerical array and directly use mean with the specific dimension.
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Dyuman Joshi
Dyuman Joshi 2023-10-23
From what I understood by the description you gave, try this -
(I didn't understand the bit about the 10 bins.)
idx = findgroups(arr(:,1));
u = unique(idx);
c = zeros(numel(u),3);
for j=1:3
c(:,j)=splitapply(@mean,arr(:,j),idx);
end
figure
plot(c(:,1), c(:,2), 'b.')
hold on
plot(c(:,1), c(:,3), 'r.')
If this does not work, please attach the data for "arr".

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