Modifying sequential filenames with padded numbers

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Jason
Jason 2026-1-7
编辑： Jason 2026-1-7
Hello, I am trying to create some file names to save a setr of images and have so far done this:
>> filenames = "clock_" + string(1:8) + ".jpg";
>> filenames'
ans =
8×1 string array
"clock_1.jpg"
"clock_2.jpg"
"clock_3.jpg"
"clock_4.jpg"
"clock_5.jpg"
"clock_6.jpg"
"clock_7.jpg"
"clock_8.jpg"
I'd like to improve on this and have the numers like this:
"clock_001.jpg"
"clock_002.jpg"
"clock_003.jpg"
and to be able to change the starting value. For example, start at 11 would be:
"clock_011.jpg"
"clock_012.jpg"
"clock_013.jpg"
and as a last request I'd like to prefix the current datetime using now()
Thanks

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采纳的回答

Stephen23
Stephen23 2026-1-7
编辑：Stephen23 2026-1-7
Ran in:
Use https://www.mathworks.com/help/matlab/ref/string.compose.html
Avoid superfluous type conversion, REPMAT, and concatenation of data into one string array.
dt = datetime('now','Format','d-MMM HH_mm_ss');
nv = 1:48;
ez = compose("IM_SaperaSave_%03d_%s.tif", nv(:),dt)
ez = 48×1 string array
"IM_SaperaSave_001_7-Jan 17_16_18.tif" "IM_SaperaSave_002_7-Jan 17_16_18.tif" "IM_SaperaSave_003_7-Jan 17_16_18.tif" "IM_SaperaSave_004_7-Jan 17_16_18.tif" "IM_SaperaSave_005_7-Jan 17_16_18.tif" "IM_SaperaSave_006_7-Jan 17_16_18.tif" "IM_SaperaSave_007_7-Jan 17_16_18.tif" "IM_SaperaSave_008_7-Jan 17_16_18.tif" "IM_SaperaSave_009_7-Jan 17_16_18.tif" "IM_SaperaSave_010_7-Jan 17_16_18.tif" "IM_SaperaSave_011_7-Jan 17_16_18.tif" "IM_SaperaSave_012_7-Jan 17_16_18.tif" "IM_SaperaSave_013_7-Jan 17_16_18.tif" "IM_SaperaSave_014_7-Jan 17_16_18.tif" "IM_SaperaSave_015_7-Jan 17_16_18.tif" "IM_SaperaSave_016_7-Jan 17_16_18.tif" "IM_SaperaSave_017_7-Jan 17_16_18.tif" "IM_SaperaSave_018_7-Jan 17_16_18.tif" "IM_SaperaSave_019_7-Jan 17_16_18.tif" "IM_SaperaSave_020_7-Jan 17_16_18.tif" "IM_SaperaSave_021_7-Jan 17_16_18.tif" "IM_SaperaSave_022_7-Jan 17_16_18.tif" "IM_SaperaSave_023_7-Jan 17_16_18.tif" "IM_SaperaSave_024_7-Jan 17_16_18.tif" "IM_SaperaSave_025_7-Jan 17_16_18.tif" "IM_SaperaSave_026_7-Jan 17_16_18.tif" "IM_SaperaSave_027_7-Jan 17_16_18.tif" "IM_SaperaSave_028_7-Jan 17_16_18.tif" "IM_SaperaSave_029_7-Jan 17_16_18.tif" "IM_SaperaSave_030_7-Jan 17_16_18.tif"

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