Plot different classes in different colors

Question

Rafael Freire 2011-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/4951-plot-different-classes-in-different-colors

评论： Walter Roberson 2018-3-26

I' m doing a pca and I want make a general function to plot two different classes in different colors( blue square, red circle) in the same figure and i want to use this funtion in any other experiment

Resuming: for the data above, the values of class 1 must be in different color in the class 2 in the same figure

for example

 Var1     Var2    Var*n*   Class
3     0.22    12         1  
4     0.23    11         1 
8     0.21    15         2
1     0.21    16         1
9     0.23    14         2

Best regards Rafael

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bym 2011-4-6

do you want to plot Var1 vs Var2, or each variable in a separate plot colored according to class?

Rafael Freire 2011-4-7

Var1 x Var2

Like PC1xPC2

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Answer 1

Walter Roberson 2011-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/4951-plot-different-classes-in-different-colors#answer_6906

在 MATLAB Online 中打开

class1 = V(:,4) == 1;
plot3(V(class1,1), V(class1,2), V(class1,3), 'bs.');
hold on
plot3(V(~class1,1), V(~class1,2), V(~class1,3), 'ro.');

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joynjo 2018-3-24

how to show different color of score in image?

Walter Roberson 2018-3-26

The 'b' and 'r' control color.

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Answer 2

Matt Tearle 2011-4-7

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https://ww2.mathworks.cn/matlabcentral/answers/4951-plot-different-classes-in-different-colors#answer_7013

gscatter doesn't do what you're looking for?

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Rafael Freire 2011-4-7

works fine too.

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Answer 3

Rafael Freire 2011-4-7

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/4951-plot-different-classes-in-different-colors#answer_7051

在 MATLAB Online 中打开

I done that above, but I don´t Know if its right. One it is the set that has values of 1 and 2 and another is the class that assume values of 1 and 2; in pca the plots must be visualized in two different regions that is the 2 classes and in each region has 2 set of experiments, set 1 and set 2.

set1=milk(:,12)==1;
set2=milk(:,12)==2;
class1=milk(:,13)==1;
class2=milk(:,13)==2;
 setclass11=class1&set1;
setclass12=class1&set2;
setcclass21=class2&set1;
setclass22=class2&set2;
 figure
 hold on;
plot (scores(setclass11,1),scores(setclass11,2),'.r','markersize', 20);
plot (scores(setclass12,1),scores(setclass12,2),'.m','markersize', 20);
plot (scores(setclass21,1),scores(setclass21,2),'^b','markersize', 7);
plot (scores(setclass22,1),scores(setclass22,2),'^c','markersize', 7);