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How to make equally spaced symbols on a line plot

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Em
Em 2023-7-24
编辑： Voss 2023-7-24
I have a line plot (created from an array with many many points) and I want to use symbols rather than colours to indicate the different data. Does anyone know how to do this?
I know you can't simply add 'o' at the end because this gives error message 'The end operator must be used within an array index expression'
Cheers!
  2 个评论
Em
Em 2023-7-24
The below line works just fine
plot(var1(end-1000:end,1)*10^-6, var1(end-1000:end,3)*10^9)
I want to plot it with symbols e.g.
plot(var1(end-1000:end,1)*10^-6, var1(end-1000:end,3)*10^9, 'o')

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回答（1 个）

Voss
Voss 2023-7-24
Ran in:
Do you want something like this?
x = 1:100;
y = sin(x/10);
plot(x,y) % the whole line
hold on
plot(x(1:10:end),y(1:10:end),'bo') % markers every so often
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显示 2更早的评论
Em
Em 2023-7-24
You're right, I didn't have the right .mat file loaded! Sorry to you or to anyone else who is viewing this - I edited my reply before I saw that you had replied.
I'm getting another error message when I include the ':10:' part of my code. Do you have any idea why this might be?
Cheers.
Voss
Voss 2023-7-24
编辑：Voss 2023-7-24
Instead of this:
plot(s9a(end-1000:10:end,1)*10^-6, s9a(end-1000:10:end,3)*10^9,'Color',c(5,:), 'o')
Do this:
plot(s9a(end-1000:10:end,1)*10^-6, s9a(end-1000:10:end,3)*10^9,'o','Color',c(5,:))
Property/Value pairs, like 'Color',c(5,:), must come at the end of the list of arguments to plot.

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