MATLAB: Scatter X and Y must be of same length

MATLABscatter

I have a 100×3 array named data that I wanted a scatter plot of

I did Scatter(data,zeros(length(data),3),'bs','filled')

Here X and Y are of same length,but the error states otherwise.

Help please?

Best Answer

Does this do what you want?

data = rand(100,3);
figure(1)
scatter3(data(:,1), data(:,2), data(:,3), 'bs', 'filled')

Replace my data statement with yours so you don’t overwrite it. I created it to test the code.

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h = 0.01; % time step
dxdt = @(x,y) y;
dydt = @(x,y) x-x^3;
m = 100 ;
x = zeros(m,1) ;
y = zeros(m,1) ; 
x(1)=1;
y(1)=1;
for i=1:1:m-1
    x(i+1) = x(i) + h*dxdt(x(i), y(i));
    y(i+1) = y(i) + h*dydt(x(i), y(i));
end
% Data Matrices X
 X = [x y x.^2 x.*y x.^2.*y x.*y.^2 y.^2 y.^3 y.*x.^3 x.*y.^3 y.^3 x.^4 y.*x.^4 y.^4];

MATLAB: Freeman chain code object plot

clear; clc; close all;
%Standard clearing of workspace
cc = '03222232232232332334435455455556555545555555454545454454445444444444344444344434443444344344344434434434434434434344343443434343443434343434434343434343434334343434343343434334343343433434334334343343343343343343343343343343343343334334334333433433433343334334333433343333433343333433334333334333334333333433333333343333333333333333333333333333333333333323333333233333323333323333233323332333233323323323323323323323233233232323323232323232332232323232323223232322323223232232232232232223223222322232222322232222232222222322222222232222222222222222221221221221221221212121212121212112121212121212121212121212121223343343343343433433556565556556565565565655655656556556565565565565555655565556565565565565565656556565655656566565656566565665665656656665665665666566656666566665666665666666566666666665666666666666666666666666666666676666666666766666667666667666667666676667666766676667667666766766766766767667667676676767667676767676767676767676767767677676767767767767767767767776776777767776777776777777677777777777777776778777777777778777777787777877778777877787778778778778778778778778787787877878787787878787787878787878787787878787878877887878787878788787878878787887878878788787887887887887887878887887887887888788788878887888878887888878888788888788888878888888788888888887888888888888888888888888888818888888888188888818888818888188818881888188188188188181881818188181818181811818181181181181181181111811111181111111111122222';
sz = 25;
c = 'r';
x = zeros(strlength(cc)+1,1); %Consider storing values and pre-allocating to save time
y = zeros(strlength(cc)+1,1); 
x(1) = 100;
y(1) = 50;

If saving the values is required, this is one way to accomplish that. It also allows for faster plotting.

figure %Creates a blank figure object
for i = 1 : strlength(cc)
    switch str2double(cc(i)) %Switches are faster than if/elseif with this many options
        case {0 8} %Assumes 0 and 8 are the same case
            x(i+1) = x(i)+1;
            y(i+1) = y(i);
        case 1
            x(i+1) = x(i)+1;
            y(i+1) = y(i)+1;
        case 2
            x(i+1) = x(i);
            y(i+1) = y(i)+1;
        case 3
            x(i+1) = x(i)-1;
            y(i+1) = y(i)+1;
        case 4
            x(i+1) = x(i)-1;
            y(i+1) = y(i);
        case 5
            x(i+1) = x(i)-1;
            y(i+1) = y(i)-1;
        case 6
            x(i+1) = x(i);
            y(i+1) = y(i)-1;
        case 7
            x(i+1) = x(i)+1;
            y(i+1) = y(i)-1;
        otherwise
            error('Invalid')
    end
end
%One plot for efficiency
scatter(x,y,sz,c,'filled')
%Sets plot area and aspect ratio to display image properly
axis tight
daspect([1 1 1])

Output:

Best Answer

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