Plot line with custom color

Hi,

How to plot a line with custom color in matlab?

I want to use the color [0 0.5 0]

Normally, I would plot it as: plot(x, y, '-g', 'LineWidth', 1) but not sure if this is the right syntax for what I want:

plot(x, y, -[0 0.5 0], 'LineWidth', 1)

Answer 1

[Les Beckham]

This looks a bit jaggedy and dark here, but looks good in my desktop Matlab.

If you had read the documentation for plot, you could have figured this out yourself.

x = linspace(0, 4*pi);
y = sin(x);
plot(x, y, 'Color', [0 0.5 0], 'LineWidth', 1)
grid on

[Les Beckham]

Also, if you are just getting started with Matlab, I would highly recommend that you take a couple of hours to go through the free online tutorial: Matlab Onramp

[MattC]

Thank you @Les Beckham. Is it possible to add markers in the starting and ending of a line?

I am trying to modify it in a way I can add marker in front of the line as well, like it is currently towards the end of line.

My code looks something like:

Start = ['230315';'230321';'230324'];
End = ['230320';'230323';'230324'];
Var1 = [0.2;0.2;0.1];
Var2 = [0.2;0.3;0.2];
Var3 = [0.3;0.3;1.7];
Count = [23;65;24];
minCount = [24;24;24];
tablex = table(Start,End,Var1,Var2,Var3,Count,minCount);

% Convert dates to datetime format
startdate_num = datenum(datetime(Start,'InputFormat','yyMMdd'));
enddate_num = datenum(datetime(End,'InputFormat','yyMMdd'));
tablex.Start_datetime = datetime(startdate_num,'ConvertFrom','datenum');
tablex.End_datetime = datetime(enddate_num,'ConvertFrom','datenum');

grid on
box on
hold on

% Define markers
Marker1 = '*';
Marker2 = 's';
Marker3 = '+';
for i = 1:size(tablex,1)
    
    % Get current row data
    currentStart = tablex.Start_datetime(i);
    currentEnd = tablex.End_datetime(i);
    currentVar1 = tablex.Var1(i);
    currentVar2 = tablex.Var2(i);
    currentVar3 = tablex.Var3(i);
    if currentStart ~= currentEnd
        x = [currentStart currentEnd];
        if Count(i) < minCount(i)
            plot(currentEnd, currentVar1, Marker1, 'Color', 'b')
            plot(currentEnd, currentVar2, Marker2, 'Color', 'b')
            plot(currentEnd, currentVar3, Marker3, 'Color', 'b')
            plot(x, [currentVar1 currentVar1], '-b', 'LineWidth', 1)
            plot(x, [currentVar2 currentVar2], '-b', 'LineWidth', 1)
            plot(x, [currentVar3 currentVar3], '-b', 'LineWidth', 1)
        end
    end
end

[Les Beckham]

Plot the markers and the line at the same time. See below.

I'm not sure why the lines don't seem to be where I would expect them to be, but that isn't what you were asking about.

Start = ['230315';'230321';'230324'];
End = ['230320';'230323';'230324'];
Var1 = [0.2;0.2;0.1];
Var2 = [0.2;0.3;0.2];
Var3 = [0.3;0.3;1.7];
Count = [23;65;24];
minCount = [24;24;24];
tablex = table(Start,End,Var1,Var2,Var3,Count,minCount);

% Convert dates to datetime format
startdate_num = datenum(datetime(Start,'InputFormat','yyMMdd'));
enddate_num = datenum(datetime(End,'InputFormat','yyMMdd'));
tablex.Start_datetime = datetime(startdate_num,'ConvertFrom','datenum');
tablex.End_datetime = datetime(enddate_num,'ConvertFrom','datenum');

grid on
box on
hold on

% Define markers
Markers = ['*s+'];
Colors = { 'r', 'b', [0 0.5 0]};

for i = 1:size(tablex,1)
    
    % Get current row data
    currentStart = tablex.Start_datetime(i);
    currentEnd = tablex.End_datetime(i);
    currentVar1 = tablex.Var1(i);
    currentVar2 = tablex.Var2(i);
    currentVar3 = tablex.Var3(i);
    if currentStart ~= currentEnd
        x = [currentStart currentEnd];
        if Count(i) < minCount(i)
            % plot(currentEnd, currentVar1, Marker1, 'Color', 'b')
            % plot(currentEnd, currentVar2, Marker2, 'Color', 'b')
            % plot(currentEnd, currentVar3, Marker3, 'Color', 'b')
            plot(x, [currentVar1 currentVar1], 'Color', Colors{1}, 'Marker', Markers(1), 'LineWidth', 1)
            plot(x, [currentVar2 currentVar2], 'Color', Colors{2}, 'Marker', Markers(2), 'LineWidth', 1)
            plot(x, [currentVar3 currentVar3], 'Color', Colors{3}, 'Marker', Markers(2), 'LineWidth', 1)
        end
    end
end
grid on

currentVar1

currentVar1 = 0.1000

currentVar2

currentVar2 = 0.2000

currentVar3

currentVar3 = 1.7000