HOW TO PLOT DATA BASED ON DATA IN ANOTHER COLUMN

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diala yazbeck 2021-2-21

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评论： Cris LaPierre 2021-2-23

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HI!

i have 5 coloumns of data wiht over 1000 entries.

i want to plot column 4 and 5 against each other (x and y respectively) based on the value in column 1.

for example.

for length of coloumns 
    for value in column 1 = 1 
    plot corresponsponding column 4 and 5 values 
    for value column 1 = 2 
    plot corresponsponding column 4 and 5 vlaues
etc
end 

i want to plot the conditions in a different colour as well.

please help :)

回答（1 个）

Cris LaPierre 2021-2-22

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What type of plot do you want? If a scatter plot, use gscatter.

% Create data

A=[randi(2,100,1),rand(100,1),rand(100,1)];

A=sortrows(A,2);

ind = A(:,1)==1;

% Create grouped scatter plot

gscatter(A(:,2),A(:,3),A(:,1))

If you prefer a line plot instead, use logical indexing to select your groups. Here's a simple example assuming two groups in column 1.

figure

% Use logical indexing to identify one group

ind = A(:,1)==1;

% Use 'not ==1' syntax to plot second group

plot(A(ind,2),A(ind,3),A(~ind,2),A(~ind,3))

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diala yazbeck 2021-2-23

ignore the data legend!

Cris LaPierre 2021-2-23

What isn't working? gscatter should work fine for any similarly formatted data. The only limiting input right now is the specified colors. Remove the 'rb' input, and see if your code runs for any data file. If it does, then we can worry about specifying color.

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