Number to time of day conversion with datestr problem....

Question

karan 2011-12-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/24307-number-to-time-of-day-conversion-with-datestr-problem

Hi , I have an analysed data-set that I want to present the user.This data set has analysis for a time series data, therefore i have produced aggregated data for every 15 minutes.

Now since this has to be organised, i wanted to make colums of time periods of data that i want to illustrate. I used the following lines of code:

     tp = 15/(24*60)
     kilo = 1:(24*60/15);
     l = datestr(kilo*tp,'HH:MM PM')

for first 5 points i get:::

l =
15 AM
30 AM
45 AM
00 AM
15 AM

Now the main problem is the accessibility with this new matrix l ..

%%%%%%%%%%%%%%%%
  l(1:9)
    ans =
    111  2221
  %%%%%%%%%%%%%%%%%
  l(1)
ans =
1
%%%%%%%%%%%%

instead of the above answers i want l(1) to give me '12:15 AM' and not '1'

Thank you very much for your help in advance.

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Answer 1

the cyclist 2011-12-19

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在 MATLAB Online 中打开

Your output "l" is a character array, of dimension 96x8. The first row of that array can be displayed with

>> l(1,:)

rather than

>> l(1)

which is only the first character.

The reason that l(1:9) gave the output that you saw is the MATLAB is pulling the first 9 characters going down the first column.

You could convert that character array to a 96x1 cell array, where each row will be put into one element of the cell array, using

>> timeCell = cellstr(l)

Then,

>> timeCell{1}

would be the entire first row. (Note the curly brackets in that last expression, which are used to access the contents of the cell, rather than the cell itself.)