pop_ploterps plot waves in accordance to a color scheme

I am trying to avoid the cycling of colors in pop_ploterps (in bold). I want my plot waves to follow a uniform color scheme like parula, I tried replacing it with the rgb and hex format but linespec only accepts strings. Is there any way that I could do this?

ERP = pop_ploterps( ERP, 1:50, [1:64] , 'AutoYlim', 'on', 'Axsize', [ 0.05 0.08], 'BinNum', 'on', 'Blc', 'pre', 'Box',...

[ 3 4], 'ChLabel', 'on', 'FontSizeChan', 10, 'FontSizeLeg', 12, 'FontSizeTicks', 10, 'LegPos', 'none', 'Linespec', {'k-' , 'r-' , 'b-' ,...

'g-' , 'c-' , 'm-' , 'y-' , 'w-' , 'k-' , 'r-' , 'b-' , 'g-' , 'c-' , 'm-' , 'y-' , 'w-' , 'k-' , 'r-' , 'b-' , 'g-' , 'c-' , 'm-' , 'y-' ,...

'w-' , 'k-' , 'r-' , 'b-' , 'g-' , 'c-' , 'm-' , 'y-' , 'w-' , 'k-' , 'r-' , 'b-' , 'g-' , 'c-' , 'm-' , 'y-' , 'w-' , 'k-' , 'r-' , 'b-' ,...

'g-' , 'c-' , 'm-' , 'y-' , 'w-' , 'k-' , 'r-' }, 'LineWidth', 0.3, 'Maximize', 'on', 'Position', [ 24.5 11.5 106.875 31.9444], 'Style',...

'Classic', 'Tag', 'ERP_figure', 'Transparency', 0, 'xscale', [ -100.0 4999.0 -50 0:800:4000 ], 'YDir', 'normal' );

Thank you!

Answer 1

[Gojo]

Hey Maemi Jane,

Although I don't have access to the EEGLAB toolbox, I can offer some ideas on how waves might be plotted using a color gradient.

You can alter the 'ColorOrder' axes-property to plot multiple waves in accordance with a color scheme. For instance, check out the following example:

https://www.mathworks.com/matlabcentral/answers/164277-plot-multiple-lines-with-gradient-gray-hue

You can apply a color gradient within the same wave using the "surface" or "patch" functions. Have a look at the following MATLAB Answer case:

https://www.mathworks.com/matlabcentral/answers/5042-how-do-i-vary-color-along-a-2d-line

You can plot your desired dataset using either function as mentioned. You can use colormaps like "Parula". Refer to the following code snippet:

x = linspace(0, 2*pi, 100); 
y = cos(x); 
patch([x nan],[y nan],[y nan],[x nan], 'edgecolor', 'interp');  
colorbar; 
colormap(parula); 

Additionally, you can make changes to an existing line plot and add gradient to it. Refer to the following code snippet:

n=100;
x = linspace(0, 2*pi, n); 
y = cos(x);
plot_handle = plot(x,y,'r');
cd = [uint8(parula(n)*255) uint8(ones(n,1))].';
drawnow;
set(plot_handle.Edge, 'ColorBinding','interpolated', 'ColorData',cd);

I hope this helps.