color plot arguments questions

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Hello ,what is the role of 'color' and col(d,:) arguments in the plot command?
plot(phi, eta * abs(J), 'color', col(d,:));
I couldnt find in the syntax bellow this pattern.
Thanks
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Steven Lord
Steven Lord 2019-5-10
That is using the plot(___,Name,Value) syntax where ___ is replaced by phi, eta * abs(J). 'Color' is listed in the Name-Value Pair Arguments subsection of the Input Arguments section on the plot documentation page and col(d,:) is the value for that name.
Look at the "Add Title and Axis Labels" example on the plot documentation page for a demonstration of that syntax. In that case the RGB value used to color the line is [0, 0.7, 0.9] -- no red, a lot of green, and even more blue makes the line blue-green.
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Steven Lord
Steven Lord 2019-5-10
[0 1 1] corresponds to green + blue = cyan. So if you want to plot your data in cyan yes, that will work. If you did a different combination, like [0.5 0 0] (maroon) or [0.75 0.75 0.75] (silver) it would be different colors. I got those color combinations from Wikipedia. MATLAB doesn't recognize the names 'maroon' or 'silver' but it does recognize the RGB triplet.
There are other Name / Value pairs plot recognizes, like 'LineWidth' (to make thicker or thinner lines) and 'MarkerSize' (larger or smaller markers.) The plot documentation pages lists the most commonly used one, the documentation page listing the properties of the graphics object plot returns (which is linked at the end of the plot documentation page) lists more.
v = 1:10;
plot(v, v.^2, ... % plot points on y = x.^2
'Color', [0.75 0.75 0.75], ... % in silver / light gray
'LineWidth', 4, ... % using a thick line
'Marker', 'p', ... % with star markers
'MarkerSize', 24) % and make the stars big

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