MATLAB: Auto generated scatter plot takes four argument instead of two

auto generated codescatter plot

I was trying to create a scatter plot from an excel file and autogenerate the code of the figure. Everything works fine but while trying to autogenerate the code it generates four arguments in its code instead of two which I selected during creating the figure. So When I call the function to re-create the figure it shows error. How can I solve the problem. One solution is two erase 2 arguments manually from auto generated code. But what is wrong with the auto-generated code.

Thanks in advance.

Best Answer

Syed,

Yes, it is true that in MATLAB R2014b the auto generated code for a scatter plot contains two extra input arguments. But this problem has been addressed in later releases and when I tried the same in R2019a it is generating two input arguments only. Therefore, upgrading to latest MATLAB release can help.

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MATLAB: Color gradient with linspace inside scatter.

a) the code in your question results in circles in different sizes but all the same colour, since the colour is the fourth argument, not the third.

b) Passing scalars for the colour is not documented so I wouldn't recommend it. In any case, if you pass scalars, the scalar represent colours along the figure current colormap. By the sound of it, your figure colormap is Parula, the default since R2014b. To display the colormap on your figure:

colorbar

You'll immediately see that the range of the colormap is adjusted to match the range of color. So your linspace does nothing useful since whatever start_color and end_color you chose, start_color will map to the first colour of the colormap and end_color map to the last colour.

To answer your question, select a different colormap:

scatter(p(1, :), p(2, :), 10, 1:size(p, 2), 'filled');
colormap('jet');

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 set(gcf,'Color','w')

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