How can I add error bars on a scatter plot using the calculated errors?

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ZZ
ZZ 2014-7-18
编辑： per isakson 2017-3-1
I want to add error bars to this graph: (SEM is the standard error mean for Dt, and I want to add error bars only onto Dt in the graph)
dfs= [ 0 4.5000 9.0000 13.5000 18.0000 22.5000 27.0000 31.5000]
Dt= [ 4.1681 4.1719 3.8631 4.1915 3.2843 3.2850 3.2308 3.2795]
R= [ 6.2272 7.4491 8.4765 7.7533 9.3598 12.9844 13.9740 9.2937]
f(1)=figure; plot (dfs.',Dt,'ro',dfs.',R,'bo');
SEM = [ 0.0142 0.0142 0.0127 0.0164 0.0183 0.0224 0.0193 0.0232];
Thanks!

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Star Strider
Star Strider 2014-7-18
The SEM values are sufficiently small that they appear as small horizontal bars. This plots both of your data series, with the error bars only plotted for Dt:
figure(1)
errorbar(dfs, Dt, SEM, 'ro')
hold on
plot(dfs,R,'bo')
hold off

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