convert time from sample to second

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cmcm 2014-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/138013-convert-time-from-sample-to-second

评论： cmcm 2014-6-28

hello .. i have a simulink program, the solver is a fixed step type (with sample time 0.001), when the program run, i have a result as shown in figure below (the time axis in sample not second) ,,, this 300 sample is almost equal 10 real seconds, how to convert the time axis to seconds instead of samples (by using plot command if possible) ?

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Image Analyst 2014-6-28

Original question (in case he edits it away like the others)

hello .. i have a simulink program, the solver is a fixed step type (with sample time 0.001), when the program run, i have a result as shown in figure below (the time axis in sample not second) ,,, this 300 sample is almost equal 10 real seconds, how to convert the time axis to seconds instead of samples (by using plot command if possible) ?

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Answer 1

Azzi Abdelmalek 2014-6-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/138013-convert-time-from-sample-to-second#answer_142799

在 MATLAB Online 中打开

te=0.001
xt=get(gca,'xtick')
set(gca,'xticklabel',arrayfun(@num2str,xt*te,'un',0))

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cmcm 2014-6-27

this is the new figure... and it is absolutely wrong because now i have a time axis with 0.3 second and it should be 10 seconds

cmcm 2014-6-27

编辑：Image Analyst 2014-6-27

在 MATLAB Online 中打开

this is the program i used to get this figure

t1=t(1:300000);......
>> tr1=travel(1:300000,1);........
>> tr2=travel(1:300000,2);.......
>> plot(t1,tr1,t1,tr2).........

and then i write your code ... the previous figure is what i get ...

i use the plot command after the simulink run for almost 10 seconds

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Answer 2

Daniel kiracofe 2014-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/138013-convert-time-from-sample-to-second#answer_142840

Well, if the time step is 0.001s and you have 300 samples, then 300 * 0.001 = 0.3, which is not 10s. So either you don't really have 0.001s time step, or you don't really have 10s of data. But if you are really sure that 300 samples = 10s, then you could just use linspace:

time = linspace(0, 10, 300); plot(time, data);

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cmcm 2014-6-28

yes, if we calculate it, it will be 0.3 sec. ... but this is not the real time, i count the seconds when the program run and the 300 samples was almost 10 real second :(

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