How to Split fisher iris data into 60% training and 40% Testing

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hammad younas
hammad younas 2021-12-6
回答： yanqi liu 2021-12-7
Hello I hope you are doing well.
I want to split the fisher iris dataset betwee 60% training and 40% testing Dataset How can i divide that?
i am using this Example
https://www.mathworks.com/help/stats/classification-example.html
It used all training examples not test example i want to divide it betwee train and test
load fisheriris
f = figure;
gscatter(meas(:,1), meas(:,2), species,'rgb','osd');
xlabel('Sepal length');
ylabel('Sepal width');
N = size(meas,1);
lda = fitcdiscr(meas(:,1:2),species);
ldaClass = resubPredict(lda);

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回答（2 个）

Chunru
Chunru 2021-12-6
编辑：Chunru 2021-12-6
Ran in:
load fisheriris
n = size(meas, 1);
%hpartition = cvpartition(n, 'holdout', 0.4); % 40% for test
hpartition = cvpartition(species, 'holdout', 0.4); % 40% for test
idxTrain = training(hpartition);
idxTest = test(hpartition);
pie(categorical(species(idxTrain))); % distribution of training samples
XTrain = meas(idxTrain, :);
TTrain = species(idxTrain);
XTest = meas(idxTest, :);
TTest = species(idxTest);
% Training
lda = fitcdiscr(XTrain(:,1:2), TTrain);
% Prediction
testClass = predict(lda, XTest(:, 1:2));
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Chunru
Chunru 2021-12-6
For approximately equal partition:
hpartition = cvpartition(species, 'holdout', 0.4);

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yanqi liu
yanqi liu 2021-12-7
yes，sir，may be use the follow split method ，such as
close all;
clear all;
clc;
load fisheriris
cs = categorical(species);
ds = categories(cs);
training_x = [];training_y = [];
testing_x = [];testing_y = [];
for i = 1 : length(ds)
ind = find(cs == ds{i});
% rand suffer
ind = ind(randperm(length(ind)));
% 60% training and 40% testing
training_x = [training_x; meas(ind(1:round(length(ind)*0.6)),:)];
training_y = [training_y; cs(ind(1:round(length(ind)*0.6)),:)];
testing_x = [testing_x; meas(ind(1+round(length(ind)*0.6):end),:)];
testing_y = [testing_y; cs(ind(1+round(length(ind)*0.6):end),:)];
end

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