save tic toc in duration style

Question

nirwana 2024-6-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2129996-save-tic-toc-in-duration-style

编辑： Stephen23 2024-6-20

Hi all, I would like to save my computational time using tic toc but in format duration (i am trying to use duration but I don't know how to save it).

Here is my code, so far I just get the time in second, and exact time give me number separate by comas. What I want to get is something like

1 hour 20 second saving in txt file. Do you guys can help me?

close all, clc, clear all
tStart = tic;
a=load('PE_201507_LPF7Hz_m5L3.dat');
plot(a)
tEnd = toc(tStart)     
tEnd = toc(tStart);
time_exec=datevec(tEnd./(60*60*24)) %change time in tictoc to 
name=sprintf('exec_time.txt')
dlmwrite (name,time_exec);

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Rik 2024-6-19

Do you have a specific format in mind for the txt file? For now, I will write an answer that should be close to what you want.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2024-6-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2129996-save-tic-toc-in-duration-style#answer_1474231

在 MATLAB Online 中打开

tEnd = 60*60+20
tEnd = 3620
txt = mytime(tEnd)
txt = '1 hour 20 seconds'
writelines(txt,'myfile.txt')

Checking:

type myfile.txt
1 hour 20 seconds
function str = mytime(toa)
spl = nan(1,4);
dpf = 100;
toa = ceil(toa*dpf)/dpf;
spl(4) = rem(toa,60); % seconds
toa    = fix(toa/60);
spl(3) = rem(toa,60); % minutes
toa    = fix(toa/60);
spl(2) = rem(toa,24); % hours
toa    = fix(toa/24);
spl(1) =     toa    ; % days
idt = spl~=0 | [false(1,3),~any(spl)];
idp = spl~=1 & idt;
fmt = {' %d day',' %d hour',' %d minute',' %g second';'s','s','s','s'};
str = strtrim(sprintf([fmt{[idt;idp]}],spl(idt)));
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Rik 2024-6-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2129996-save-tic-toc-in-duration-style#answer_1474241

在 MATLAB Online 中打开

The code below removes the cargo cult programming, removes the sprintf where you aren't actually using it to format a string, and replaces dlmwrite by code intended to write a text file.

I separated out the code to convert a number of seconds to a char vector. It is far from optimal, but since it uses the duration class, it is fairly easy to change to suit your needs. Note that this skips a time element if it is 0 (so it will reproduce your example of 1 hour and 20 seconds).

tStart = tic;
a=load('PE_201507_LPF7Hz_m5L3.dat');
plot(a)
tEnd = toc(tStart);
fid = fopen('exec_time.txt','w');
fprintf(fid,'%s',SecondToTimeStr(tEnd));
fclose(fid);
function str=SecondToTimeStr(sec)
% This function takes a scalar containing the time in seconds.
% The returned value is a char vector.
D = duration(0,0,sec);
str = '';
if hours(D)>0
    plural = ''; if hours(D)>1,plural = 's';end
    str = [str sprintf('%.0f hour%s',hours(D),plural)];
    D = D - hours(floor(hours(D)));
end
if minutes(D)>0
    if ~isempty(str),str = [str ', '];end
    plural = ''; if minutes(D)>1,plural = 's';end
    str = [str sprintf('%.0f minute%s',minutes(D),plural)];
    D = D - minutes(floor(minutes(D)));
end
if seconds(D)>0
    if ~isempty(str),str = [str ', '];end
    plural = ''; if seconds(D)>1,plural = 's';end
    str = [str sprintf('%.0f second%s',seconds(D),plural)];
end
end

8 个评论
显示 6更早的评论隐藏 6更早的评论

Steven Lord 2024-6-19

在 MATLAB Online 中打开

@Stephen23: Would you expect those properties to be the value of the duration converted into that unit or that component of the duration? So if I had:

du = seconds(61)
du = duration
   61 sec

should its minute property be 1 since du is 1 minute plus 1 second, or should it be 61/60 since (61 seconds) * (1/60 minutes/second) gives the result units of minutes?

This seems like a reasonable enhancement request, as long as you state which of those options would be your preference and why. [I expect to see at least a few such enhancement requests, and I'm not sure what the distribution of options is going to be. I'm pretty sure it won't be unanimous, but I'm not certain it'll be 50/50.]

@Rik There are seconds, minutes, hours, and days functions that convert the value of the duration into those units. Having properties or methods that return the components would be possible, but the most natural names are already taken.

du = duration(25, 37, 18)
du = duration
   25:37:18
days(du)
ans = 1.0676
hours(du)
ans = 25.6217
minutes(du)
ans = 1.5373e+03
seconds(du)
ans = 92238

If you're doing calendar arithmetic (as opposed to date and time arithmetic) that takes into account things like leap years, you may want to use calendarDuration instead of duration.

notMidnight = datetime('today') + years(1) % add 1 year (duration) = 365.2425 days
notMidnight = datetime
   19-Jun-2025 05:49:12
midnight = datetime('today') + calyears(1) % effectively, increment year # by 1
midnight = datetime
   19-Jun-2025

Steven Lord 2024-6-20

在 MATLAB Online 中打开

@Rik Making the Format property for duration objects more flexible (especially with respect to literal characters) like the Format property for datetime objects seems like a reasonable enhancement request.

dt = datetime('today', Format = "'It is' eeee, MMMM d, yyyy")
dt = datetime
   It is Thursday, June 20, 2024

It probably wouldn't have the exact syntax you showed (fprintf-style format specs aren't always the easiest piece of functionality to understand) but if you could specify the duration format as something like

fmt = "d 'days', h 'hours'"
fmt = "d 'days', h 'hours'"

would that satisfy the use cases you have in mind?

@Stephen23 Having du.minutes [property access] and minutes(du) [method call] return different things 1) may not be possible without perhaps careful overloading of both types of indexing and 2) sounds like a strong source of confusion going forward. We have enough trouble at times with functions that are named similarly but not identically! [Example: one of the functions findstr and strfind is listed as discouraged on its documentation page. Without checking, can you tell me which one?]

Having a property named minute and a method named minutes is technically possible, but again is likely to require some thought and/or checking the documentation each time you use them to determine which one you want to use. I can think of many cases where we have function names that differ by one extra character but usually those "just plain work" in common cases where you pass the inputs valid for one into the other (eig and eigs is one example) or the meaning of the extra character is IMO easy to understand and/or remember in context (sin for radian-based sine, sind for degree-based sine.)

Stephen23 2024-6-20

编辑：Stephen23 2024-6-20

@Steven Lord: for the properties I would stick to the singular, just like DATETIME does.

Or if confusion with the methods is a concern, then the properties could be simply d, h, m, s.

请先登录，再进行评论。

save tic toc in duration style

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

回答（2 个）

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

8 个评论
显示 6更早的评论隐藏 6更早的评论

另请参阅

类别

标签

Community Treasure Hunt

save tic toc in duration style

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

回答（2 个）

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

8 个评论 显示 6更早的评论隐藏 6更早的评论

另请参阅

类别

标签

Community Treasure Hunt

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

8 个评论
显示 6更早的评论隐藏 6更早的评论