Merging vectors and plotting

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T 2013-9-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/86462-merging-vectors-and-plotting

Suppose you have the following time vectors in seconds:

A = 
0
1
2
3
4
5
6
7
8
9
10
and 
B =
3.1
3.6
3.7
4.1
4.3
4.6
4.8
5.1
5.4
5.8
6.7
6.8
6.8

Can one merge A and B to establish one time vector? What if there are values associated with each element in A and B? Or does one have to plot each separetly using plotyy?

采纳的回答

Walter Roberson 2013-9-5

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/86462-merging-vectors-and-plotting#answer_95945

在 MATLAB Online 中打开

unique([A;B])

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Walter Roberson 2013-9-8

在 MATLAB Online 中打开

mergedtimes = unique([A;B;time_seconds]);
timespacing = 0.1;         %adjust this as needed!
mintime = mergedtimes(1);
maxtime = mergedtimes(2);
sample_at_times = mintime : timespacing : maxtime;
[counts, Abinidx] = histc( sample_at_times, [-inf, Atimes, inf] );
[counts, Bbinidx] = histc( sample_at_times, [-inf, Btimes, inf] );
[counts, ybinidx] = histc( sample_at_times, [-inf, time_seconds, inf] );
A_held = zeros(size(sample_at_times));
B_held = zeros(size(sample_at_times));
y_held = zeros(size(sample_at_times));
Amask = Abinidx > 1 & Abinidx <= length(Atimes) + 1;  times within A
Bmask = Bbinidx > 1 & Bbinidx <= length(Btimes) + 1;
ymask = ybinidx > 1 & ybinidx <= length(time_seconds) + 1;
A_held(Amask) = Avals(Abinidx(Amask)-1);
B_held(Bmask) = Bvals(Bbinidx(Bmask)-1);
y_held(ymask) = value(ybinidx(ymask)-1);

Now take a closer look at those last three and see that the values being written into the "held" variables are not the time values, but are instead the A, B, or y value. And everything before the first relevant time for each will be 0, and everything after the first relevant time for each will be 0 (you didn't say what to do at the end.)

Walter Roberson 2013-9-8

Unless your vectors are much longer than you show, the easiest thing would be to re-run the B portion of above after adding the new time and value to the Btimes and Bvals. If the new time is after all of the old times, the easiest thing to do is rerun all of the above.

T 2013-9-8