customize size each dot in a scatter plot

Hello!

Lets start... I have an array of data, to simplify, only two columns, X and Y.

I did some previous calculation in teh array, and I only want to plot some positions of the array.

The positions to be plotted are stored in a vector.

To plot the points I just using

plot(Array_specs(index,1),Array_specs(index,2))

so far so good... now, for each x,y I would like to assign different weight by making the dot bigger.

I know this is done with LineWidth.. but linewidth do not accept a vector as an input.. this means that I need to manually plot each point in the scatter plot,

plot(Array_specs(index(i),1),Array_specs(index(i),2), 'LineWidth', number(index(i)) )

the problem is that the function takes really long time, as obviusly it is not optimized. Is any optimum way to do that?

How can assign a different linewidth to each of my XY points without manually check the array?

Best Regards,

Miguel

Answer 1

[Image Analyst]

Try using scatter. With scatter() can specify sizes and colors for each element in your (x,y) pairs.

numPoints = 300;
x = rand(1, numPoints) - 0.5;
y = rand(size(x)) - 0.5;
% Sizes = distance from origin
sizes = 200 * sqrt(x.^2 + y.^ 2);

% Colors according to the jet colormap and distance from origin.
indexes = round(rescale(sizes, 1, numPoints));
colors = jet(numPoints);	% Initialize
colors = colors(indexes,:); % Colored according to distance.

% Do the plot
scatter(x, y, sizes, colors, 'filled');
grid on;

Answer 2

[Miguel Usach]

Perfect! Thanks!