Match Xticks to Datapoints
显示 更早的评论
Hello,
I am currently trying to plot some kind of term structure of Value at Risk estimates and I am struggling to fit the xticks correctly. My code correctly displays 500 days with the approriate spaces between the "days", but I don't get how to match my datapoints (6 in total) to the right period (i. e. 10 days estimate to 10 days point, 30 days estimate to 30 days point and so on). I tried a different approach with datetime, but then it is impossible to just display days and not specific dates.
TermStructure = [VaR1D; VaR10D; VaR30D; VaR125D; VaR1Y; VaR2Y]
x = linspace(0,500,length(TermStructure))
plot(x, TermStructure)
xticks([1 10 30 125 250 500])
Thanks a lot in advance for any suggestions.
Leo
采纳的回答
x=[1 10 30 125 250 500];
plot(x,sort(randi(40,[6,1])),'*-')
xticks(0:100:500)
will duplicate the above with the addition of a marker at the datapoints instead of just the line segments. Salt to suit...
更多回答（1 个）
"with datetime, but then it is impossible to just display days and not specific dates."
Au contraire, good buddy!
tt=array2timetable(rand(100,1),'RowTimes',datetime(date)+days(linspace(0,500)).'); % make up something
>> head(tt)
ans =
8×1 timetable
Time Var1
____________________ _______
07-Feb-2021 00:00:00 0.16931
12-Feb-2021 01:12:43 0.78235
17-Feb-2021 02:25:27 0.34228
22-Feb-2021 03:38:10 0.54597
27-Feb-2021 04:50:54 0.55591
04-Mar-2021 06:03:38 0.20465
09-Mar-2021 07:16:21 0.59334
14-Mar-2021 08:29:05 0.93012
>> figure; plot(tt.Time,tt.Var1) % and plot it
>> hAx=gca; % get axes handle
>> hAx.XAxis.TickLabelFormat % display default time axes format
ans =
'MMM u'
>> hAx.XAxis.TickLabelFormat='dd'; % set to days, two digits
yields
This time scale happens to have default tick spacing at beginnings of months so all are day one, but it shows only the day.
You may be wanting a duration here, not a date if is elapsed days since some point.
Then again, it isn't clear to me what "match my datapoints (6 in total) to the right period" really means, either; if it is that you have a set of calculations (6?) to some calculated time frame over which those were calculated, you may not want a time axes at all but simply an ordinal plot with labels to match the period lengths.
TermStructure = randi(300,[6,1]);
x=categorical({'1Day'; '10Days'; '30Days; '125Days'; '1Year'; '2Years'}, ...
{'1Day'; '10Days'; '30Days'; '125Days'; '1Year'; '2Years'},'ordinal',1));
plot(x, TermStructure)
5 个评论
Leonard Meyer
2021-2-7
Adam Danz
2021-2-7
It's not clear to me what the goal is or the type of data you're working with.
Do you want durations along the x axis? What determines those durations?
Leonard Meyer
2021-2-7
I definitely don't want a simple ordinal plot, since that defies the correct time proportions.
"You may be wanting a duration here, not a date if is elapsed days since some point". Elapsed days since day 0 would be it, I think.
I attached an excel solution below, but I would prefer it to be done in Matlab for future projects as well!
Leonard Meyer
2021-2-7
dpb
2021-2-7
"what exactly you are doing in the line with "make something up"
Just created a dummy timetable with one variable over a time period of 100 entries spread out over 500 days. It was so had something to use in plot command below.
类别
在 帮助中心 和 File Exchange 中查找有关 Annotations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
