Looping string array into parsed timestamp

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James
James 2024-9-17
评论： James 2024-9-18
I have the following data that I would like to parse into hours:minutes:secs to plot against other data.
Here is my code that is causing issues with the indexing.
TS = ["085423","085428","085431","085502"];
TS = TS';
for i = 1:length(TS)
timestr = TS(i);
end
hours = timestr(1:2);
minutes = timestr(3:4);
secs = timestr(5:6);
formatted_time_str = [hours, ':', minutes, ':', secs];
Any insight is appreciated. Thank you.

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Stephen23
Stephen23 2024-9-17
编辑：Stephen23 2024-9-17
Ran in:
"... that is causing issues with the indexing."
Because you are mixing up indexing into string arrays with the characters contained within them. Not the same things at all: indexing into a string array indexes into the string array, not into the characters it contains (as you incorrectly assumed).
TS = ["085423","085428","085431","085502"]
TS = 1x4 string array
"085423" "085428" "085431" "085502"
Method one: returns a string array:
FS = extractBefore(TS(:),3)+":"+extractBetween(TS(:),3,4)+":"+extractAfter(TS(:),4)
FS = 4x1 string array
"08:54:23" "08:54:28" "08:54:31" "08:55:02"
Method two: returns a char matrix:
FS = repmat(':',numel(TS),8);
FS(:,[1:2,4:5,7:8]) = char(TS(:))
FS = 4x8 char array
'08:54:23' '08:54:28' '08:54:31' '08:55:02'
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Stephen23
Stephen23 2024-9-18
Ran in:
"In trying to plot the FS data (timestamp) against numerical data I get an error message:"
If you are trying to plot with this data, then you are likely much better of using DURATION objects rather than fiddling around with text or numerics:
TS = ["085423";"085428";"085431";"085502"];
H = str2double(extractBefore(TS(:),3));
M = str2double(extractBetween(TS(:),3,4));
S = str2double(extractAfter(TS(:),4));
D = duration(H,M,S)
D = 4x1 duration array
08:54:23 08:54:28 08:54:31 08:55:02
Y = rand(size(D));
scatter(D,Y)

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