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how to compute the average of several repeats of a program in matlab?
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I wrote this program to classify the dataset(colon) and compute the accuracy of the classifier, I wanted to repeat the classification 10 times and save the results in an array(Arforest)and then compute the average of these results(averf) but when I test size(Arforest) the size of the result is 1 so any array isn't shaped.
clc;
clear;
close all;
tic
load colon.mat
data=colon; [n,m]=size(data);
rows=(1:n);
test_count=floor((0.2)*n);
sum_ens=0;sum_result=0;
it=10;
for k=1:it
test_rows=randsample(rows,test_count);
train_rows=setdiff(rows,test_rows);
test=data(test_rows,:);
train=data(train_rows,:);
xtest=test(:,1:m-1);
ytest=test(:,m);
xtrain=train(:,1:m-1);
ytrain=train(:,m);
[rforest, DT , sk ] = classificationa(xtest,xtrain,ytrain);
[Arforest, ADT , Ask] = allaccuracydata(rforest, DT , sk , ytest);
end
averf=mean(Arforest);
avedt=mean(ADT);
avesk=mean(Ask);
Arforest is the result of Random Forest classifier,
when I use the counter (k) an error shows:
it=10;
for k=1:it
[rforest, DT , sk ] = classificationa(xtest,xtrain,ytrain);
[Arforest(k), ADT(k) , Ask(k)] = allaccuracydata(rforest(k), DT(k) , sk(k) , ytest);
end
averf=mean(Arforest);
avedt=mean(ADT);
avesk=mean(Ask);
the error is:
Error: File: myFSmethod20.m Line: 157 Column: 19
An array for multiple LHS assignment cannot contain expressions.
I'll be gratefull to have your opinions to obtain true result.Thanks
2 个评论
Image Analyst
2019-12-22
采纳的回答
dpb
2019-12-22
编辑:dpb
2019-12-22
An array for multiple LHS assignment cannot contain expressions.
in
[Arforest(k), ADT(k) , Ask(k)] = allaccuracydata(rforest(k), DT(k) , sk(k) , ytest);
the arguments to allaccuracydata aren't arrays; they're the single-case results from the previous line. Just assign the results:
[Arforest(k) ADT(k) Ask(k)] = allaccuracydata(rforest,DT,sk,ytest);
each loop.
It would be better to preallocate the LHS arrays prior to beginning the loop.
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