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Error in For Loop

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Ararat Cetinkaya
Ararat Cetinkaya 2020-3-8
评论： Ararat Cetinkaya 2020-3-8
Hi everybody,
I have code given below, num is a 1500x3 sized matrix and it has class labels in its third column and number of the classes labels are change according to the input value . I want to keep each line in the class matrix in certain places by class number like Class 1 will be held between 1 and 400 lines,Class 2 will be held between 401 and 790 lines etc. but code gicen below always writes the values same lines
clc; clear all;
[num,txt,raw] = xlsread('data-1.xlsx');
k = input ('Enter a k value:');
for d =1:k ;
lclass = length(num(num(:,3)==d,1:2));
a(d+1) = lclass;
class(:,1:2) = [num(num(:,3)==d,1:2)];
end

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采纳的回答

David Hill
David Hill 2020-3-8
class=[];
for d =1:k ;
class= [class,num(num(:,3)==d,1:2)];
end
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David Hill
David Hill 2020-3-8
Yes, an empty matrix
Ararat Cetinkaya
Ararat Cetinkaya 2020-3-8
it helped me a lot thanks for your help.

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