Plotting multiple vertical lines with a for loop

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Cian McAuley
Cian McAuley 2020-10-21
评论： Cian McAuley 2020-10-21
I need to plot vertical lines on a graph at points defined from an array imported from an excel file.
Samples = xlsread('ProjectData.xlsx','Sampling Strategy','A6:B44');
SampleDepth = Samples(:,2);
for i = 1:SampleDepth
xline(i);
end
SampleDepth is a 29x1 double. I need it to plot a vertical line (hence using xline) for each depth specified. I thought that using a for Loop like this would therefore plot a vertical line at each specified point, but Matlab returns:
Error using xline (line 29)
Must pass in a value.
Error in IsotopeGraphs (line 24)
xline()
What needs to be done to fix this? Can xline even be used like this or does it not work?
  2 个评论
KSSV
KSSV 2020-10-21
You cannot draw a line with single point..you need to have two points...read the documentation.
what is xline by the way?
Cian McAuley
Cian McAuley 2020-10-21
You do not need two points to draw a line if you use the function xline() or yline(), which will draw a straight line perpendicular to that axis at the specified point.

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回答（3 个）

Ameer Hamza
Ameer Hamza 2020-10-21
You seem to have a function named xline() which is shadowing the built-in function xline(). Check the output of
which xline
and if it is not something like
.../toolbox/matlab/specgraph/xline.m
then change its name to something else.
Chenguang Yan
Chenguang Yan 2020-10-21
Try this
sz = size(SampleDepth,1);
for i = 1:sz
xline(SampleDepth(i));
end
Andy
Andy 2020-10-21
SampleDepth is a matrix so cannot be used to generate the for loop.
I think you meant to use the length of SampleDepth
for i = 1:length(SampleDepth)

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