adding a colormap('jet') to my grapgh please help me

script code :

clc;
close all;

center=[0,0];  %Defining the center of circle ((origin))

%Plotting the first circle at different radius and here i choose from 1 to
%5 radiuses
for radius=1:5 % for loop,  1 to 5 making five completed circle
    [x,y]=getCircle(center,radius);   %Calling the function 
    plot(x,y,'LineWidth',4);          %Plot Circle in one frame  / here Linewidth is used to adjust (increase) the width of the line of the circle
    axis([-6 6 -5 5]) %Defining required axis [ -x x -y y ]
    title('5 Circles different radius')
    grid on;
    hold on;
end %end for loop

% function code:

function [x,y]=getCircle(center,radius)
t=[0:360];
x=radius*cos(t*(pi/180)); %Claculate the x axis
y=radius*sin(t*(pi/180)); %Claculate the y axis
colormap('jet'); %i added the colormap('jet') here but still no changes can u help me please

end

Answer 1

[Image Analyst]

You can specify the color in the call to plot():

clc;
close all;
center=[0,0];  %Defining the center of circle ((origin))
%Plotting the circles at different radius.
% Here I chose from 1 to 5 radiuses.
numRadiuses = 5;
% Get the 5 colors from the "jet" colormap.
plotColors = jet(numRadiuses);
for radius=1:numRadiuses % for loop,  1 to 5 making five completed circle
    [x,y] = getCircle(center, radius);   % Calling the function
    fprintf('Printing circle #%d in this color : [%f, %f, %f].\n', ...
        radius, plotColors(radius, 1), plotColors(radius, 2), plotColors(radius, 3));
    plot(x,y, '-', 'Color', plotColors(radius, :), 'LineWidth',4);          %Plot Circle in one frame  / here Linewidth is used to adjust (increase) the width of the line of the circle
    axis([-6 6 -5 5]) %Defining required axis [ -x x -y y ]
    hold on;
end % end for loop

Printing circle #1 in this color : [0.000000, 0.500000, 1.000000].
Printing circle #2 in this color : [0.000000, 1.000000, 1.000000].
Printing circle #3 in this color : [0.500000, 1.000000, 0.500000].
Printing circle #4 in this color : [1.000000, 1.000000, 0.000000].
Printing circle #5 in this color : [1.000000, 0.500000, 0.000000].

caption = sprintf('%d Circles of different radius', numRadiuses);
title(caption)
grid on;
legend('Location', 'northwest')

% function code:
function [x,y]=getCircle(center,radius)
t = 0 : 360;
x = radius * cos(t*(pi/180)); % Calculate the x axis
y = radius * sin(t*(pi/180)); % Calculate the y axis
end

[Saleh]

you aare the best thanks

Answer 2

[Les Beckham]

center=[0,0];  %Defining the center of circle ((origin))
%Plotting the first circle at different radius and here i choose from 1 to
%5 radiuses
for radius=1:5 % for loop,  1 to 5 making five completed circle
    [x,y]=getCircle(center,radius);   %Calling the function 
    plot(x,y,'LineWidth',4);          %Plot Circle in one frame  / here Linewidth is used to adjust (increase) the width of the line of the circle
    colormap('jet'); % <<< Moved this to where it belongs
    axis([-6 6 -5 5]) %Defining required axis [ -x x -y y ]
    title('5 Circles different radius')
    grid on;
    hold on;
end %end for loop

function [x,y]=getCircle(center,radius)
t=[0:360];
x=radius*cos(t*(pi/180)); %Claculate the x axis
y=radius*sin(t*(pi/180)); %Claculate the y axis
end

[Bora Eryilmaz]

Just calling colormap is not sufficient. The colors on the plot above do not correspond to the 'jet' colormap. See https://www.mathworks.com/matlabcentral/answers/484820-why-colormap-did-not-change-the-color-of-my-plots. Also the colormap is usually effective for 3-D plots.

[Saleh]

so i cannot achieve it ?

[Bora Eryilmaz]

This might be helpful: https://www.mathworks.com/help/matlab/ref/scatter.html#btrli6o-1_1.