分酒问题matlab代码,matlab葡萄酒分类数据归一化问题

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matlab葡萄酒分类数据归一化问题% 选定训练集和测试集

% 将第一类的1-30,第二类的60-95,第三类的131-153做为训练集

train_wine = [wine(1:30,:);wine(60:95,:);wine(131:153,:)];

% 相应的训练集的标签也要分离出来

train_wine_labels = [wine_labels(1:30);wine_labels(60:95);wine_labels(131:153)];

% 将第一类的31-59,第二类的96-130,第三类的154-178做为测试集

test_wine = [wine(31:59,:);wine(96:130,:);wine(154:178,:)];

% 相应的测试集的标签也要分离出来

test_wine_labels = [wine_labels(31:59);wine_labels(96:130);wine_labels(154:178)];

[mtrain,ntrain] = size(train_wine);

[mtest,ntest] = size(test_wine);

dataset = [train_wine;test_wine];

% mapminmax为MATLAB自带的归一化函数

[dataset_scale,ps] = mapminmax(dataset',0,1);

dataset_scale = dataset_scale';

train_wine = dataset_scale(1:mtrain,:);

test_wine = dataset_scale( (mtrain+1):(mtrain+mtest),: );

为什么不可以改写为

[dataset_scale,ps] = mapminmax(wine,0,1);

train_wine = dataset_scale([wine(1:30,:);wine(60:95,:);wine(131:153,:)]);

test_wine = dataset_scale([wine(31:59,:);wine(96:130,:);wine(154:178,:)]);