WOLFRAM

Wolfram Language & System Documentation Center
Wolfram Language Home Page »

StringPadLeft
✖
StringPadLeft

✖
StringPadLeft["string",n]

makes string be of length n, padding it on the left with spaces or truncating it if necessary.

✖
StringPadLeft["string",n,"padding"]

pads by repeating copies of the string padding.

✖
StringPadLeft[{"s1","s2",…}]

pads strings with spaces on the left to make them all the same length.

✖
StringPadLeft[{"s1","s2",…},n,…]

pads or truncates to make all strings of length n.

Details

  • StringPadLeft effectively places repeated copies of padding to the left of string, truncating them when a total width of n characters has been achieved.
  • StringPadLeft[BioSequence["type","seq"],n,…] will apply the operation to the string "seq", yielding a BioSequence result.
  • The following letter is used as the default padding for each type of biomolecular sequence if not otherwise specified:
  • "DNA" or "CircularDNA"N
    "RNA"N
    "Peptide"X

Examples

open allclose all

Basic Examples  (4)Summary of the most common use cases

Pad a string with whitespace to have total length 10:

In[1]:=1
✖
https://wolfram.com/xid/0dqtkasrbv2-oi482r
Out[1]=1

Pad with a non-whitespace character:

In[1]:=1
✖
https://wolfram.com/xid/0dqtkasrbv2-gwmhdb
Out[1]=1

Make a list of strings the same length:

In[1]:=1
✖
https://wolfram.com/xid/0dqtkasrbv2-z11eow
Out[1]=1

Pad or truncate a list of strings to a given length:

In[1]:=1
✖
https://wolfram.com/xid/0dqtkasrbv2-yxxo95
Out[1]=1

Scope  (2)Survey of the scope of standard use cases

Pad a DNA sequence with characters representing an unknown upstream sequence:

In[1]:=1
✖
https://wolfram.com/xid/0dqtkasrbv2-35sqog
Out[1]=1

Pad a DNA sequence with a particular letter:

In[1]:=1
✖
https://wolfram.com/xid/0dqtkasrbv2-4h9clo
Out[1]=1
Wolfram Research (2015), StringPadLeft, Wolfram Language function, https://reference.wolfram.com/language/ref/StringPadLeft.html (updated 2020).
✖
Wolfram Research (2015), StringPadLeft, Wolfram Language function, https://reference.wolfram.com/language/ref/StringPadLeft.html (updated 2020).

Text

Wolfram Research (2015), StringPadLeft, Wolfram Language function, https://reference.wolfram.com/language/ref/StringPadLeft.html (updated 2020).

✖
Wolfram Research (2015), StringPadLeft, Wolfram Language function, https://reference.wolfram.com/language/ref/StringPadLeft.html (updated 2020).

CMS

Wolfram Language. 2015. "StringPadLeft." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/StringPadLeft.html.

✖
Wolfram Language. 2015. "StringPadLeft." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/StringPadLeft.html.

APA

Wolfram Language. (2015). StringPadLeft. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/StringPadLeft.html

✖
Wolfram Language. (2015). StringPadLeft. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/StringPadLeft.html

BibTeX

@misc{reference.wolfram_2025_stringpadleft, author="Wolfram Research", title="{StringPadLeft}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/StringPadLeft.html}", note=[Accessed: 08-July-2025 ]}

✖
@misc{reference.wolfram_2025_stringpadleft, author="Wolfram Research", title="{StringPadLeft}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/StringPadLeft.html}", note=[Accessed: 08-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_stringpadleft, organization={Wolfram Research}, title={StringPadLeft}, year={2020}, url={https://reference.wolfram.com/language/ref/StringPadLeft.html}, note=[Accessed: 08-July-2025 ]}

✖
@online{reference.wolfram_2025_stringpadleft, organization={Wolfram Research}, title={StringPadLeft}, year={2020}, url={https://reference.wolfram.com/language/ref/StringPadLeft.html}, note=[Accessed: 08-July-2025 ]}