Scatter Color Scale for Looping Script

Question

Adi Purwandana 2023-10-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030099-scatter-color-scale-for-looping-script

评论： Dyuman Joshi 2023-10-6

Dear everyone,

I have some excel files. Each file containing some columns of parameter. I want to plot all of them in one graph with different color (let's say jet colormap).

Here is my code:

A       = dir('*.xlsx');
numprof = length(A); %number of profile
couleur = jet(numprof);
hold on; 
for nn = 1:numprof
    filename = A(nn).name; 
    data     = xlsread(filename); %
    a        = data(:,1);
    b        = data(:,2);
    % Plot
     scatter(lon(1),lat(1),'filled','color',couleur(nn,:)); % plot the first row value from each excel file
end
legend(compose("% d", 1:numprof),'Location','eastoutside');

This code produce this:

The scatter colors did not following jet colormap. Does anyone know the line I should add in this script?

best regards,

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Dyuman Joshi 2023-10-6

The behaviour/functionality of scatter() is different than plot().

To clarify, you are trying to plot the first pair of points from each file?

Adi Purwandana 2023-10-6

Each file contains two columns. Let's start the loop for the 1st file... I want to plot the first row from both columns (from the 1st file off course), and let's say, this will be plotted as scatter blue (from the spectrum of jet). Then, move to the second file, I do the same and will be plotted as scatter as green... and so on... the last file will be plotted as red.

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Answer 1

Matthew Blomquist 2023-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/2030099-scatter-color-scale-for-looping-script#answer_1327994

编辑：Matthew Blomquist 2023-10-6

在 MATLAB Online 中打开

One option would be to store those values into an array within the for loop, and then plot the arrays with a colormap of jet after going through the loop. Something like:

A       = dir('*.xlsx');
numprof = length(A); %number of profile
figure() ;
hold on;
% Initialize
lon = zeros( numprof , 1 ) ;
lat = zeros( numprof , 1 ) ;
for nn = 1:numprof
    filename = A(nn).name;
    data = xlsread(filename); %
    lon(nn,1) = data(1,1);
    lat(nn,1) = data(1,2);
end
% For colorbar
c = 1 : numprof ;
% Plot
scatter(lon,lat,[],c,'filled');
colorbar
colormap jet

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Adi Purwandana 2023-10-6

在 MATLAB Online 中打开

Thank you very much @Matthew Blomquist and @Dyuman Joshi. It works fine.

Here is my final codes:

clear all;
clc;
A       = dir('*.xlsx');
A       = natsortfiles(A);
numprof = length(A); %number of profile
hold on;
% Initialize
lon = zeros( numprof,1);
lat = zeros( numprof,1);
for nn = 1:numprof
    filename = A(nn).name;
    data = readmatrix(filename); %
    lon(nn,1) = data(1,1);
    lat(nn,1) = data(1,2);
end
% For colorbar
c = 1:numprof ;
% Plot
scatter(lon,lat,[],c,'filled');
colorbar
colormap jet