MatLab datenum truncated in matrix

Question

Rhys 2012-6-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41207-matlab-datenum-truncated-in-matrix

I am writing a code for a research project in space physics and at the very end I output a matrix with time, and the magnetic field strength.

The final function is

function [time, data_out]=time_Bpar_Bperp(fname)
% Function recieves a file name and out puts time, a vector in the
% direction parallel to the magentic field  and a vector perpindicular to
% the magnetic field
[time, Bparallel] = loadthemismag(fname);
eparallel = make_eparallel(fname);
eperp = make_eperp(time, eparallel(:,2:4), fname);
Bperp = make_Bperp(eparallel(:,2:4), eperp, Bparallel(:,2:4));
cd('I:/olddrive')
Bparallel=findmagnitude(Bparallel(:,1:3));
Bperp=findmagnitude(Bperp);
data_out=[time, Bparallel, Bperp];

The data in time is about every 3 seconds but the data located in data_out(:,1) is not the same as time. When I plot time vs data_out(:,1), the resulting plot looks like stairs. Any ideas on why the time is being messed up in the matrix, and nothing is happening to it outside of it. If it matters the matrix is 28526 by 3.

Thanks,

Rhysics

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Answer 1

Walter Roberson 2012-6-14

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41207-matlab-datenum-truncated-in-matrix#answer_50789

Please confirm that time, Bparallel, and Bperp are all column vectors, and the class() of all of them is 'double'. If one of them happened to be an integer data type then putting them together in a matrix could result in them all being converted to integer.