plotting a vertical line in matlab?

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Sarah
Sarah 2012-4-18
Hey guys,
I am trying to plot a vertical line in matlab. i need to be able to change its thickness and its color. I will be plotting several vertical lines. I need to plot it at a specific point on the x-axis, and it needs to extend vertically in both directions.
Here is what I have so far:
figure;
clf;
plot(TimeNum,AirTemp1,'k.','LineWidth',1.2);
datetick('x','HH:MM:SS');
xlabel('Time'); ylabel('Temp. (deg-C)'); grid on;
line([x(668) x(668)],[-3.2 -2.8]);
set(gca,'YLim',[-3.2 -2.8])
I dont know why, but my line doesn't show up. Any help would be much appreciated!
  1 个评论
Sarah
Sarah 2012-4-18
oh sorry, i almost forgot, here is the error notice:
??? Undefined function or method 'x' for input arguments of type
'double'.

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回答（2 个）

Geoff
Geoff 2012-4-18
As the error says, you don't have a variable called x and so you can't ask for the 668th element.
You might mean this:
line([668 668],[-3.2 -2.8]);
Walter Roberson
Walter Roberson 2012-4-18
Your code
line([x(668) x(668)],[-3.2 -2.8]);
is fine. Just add appropriate options like 'LineWidth' and 'Color'.

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