How to split a matrix for different plots?

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sia ben
sia ben 2018-7-9
编辑： Stephan 2018-7-9
I have a matrix which the first column are 1 or 2 or 3 or 4 or 5 . I want to done a function and plot of datas in all rows which have in the first column same numbers. For example I habe a matrix like [ 1 23 240;2 22 100;2 44 900;1 33 800,... ]. Now I want plot a function to 1. and 4. row (f(23)& f(33))in red color and the 2. &3. row (f(22) & f (44)) with blue color. is there any solution with out loops?

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Stephan
Stephan 2018-7-9
编辑：Stephan 2018-7-9
Hi,
for your matrix A:
>> A = [ 1 23 240;2 22 100;2 44 900;1 33 800]
A =
1 23 240
2 22 100
2 44 900
1 33 800
to get the data splitted without for loop use:
>> A1 = [A(A(:,1)==1,2),A(A(:,1)==1,3)]
A1 =
23 240
33 800
>> A2 = [A(A(:,1)==2,2),A(A(:,1)==2,3)]
A2 =
22 100
44 900
Now you have splitted data which you can plot however you want:
>> plot(A1(:,1),A1(:,2),'r')
>> hold on
>> plot(A2(:,1),A2(:,2),'b')
which gives:
Best regards
Stephan

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