This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.


Convert string to uppercase


newTxt = upper(txt)


newTxt = upper(txt) converts all lowercase characters in txt to the corresponding uppercase characters and leaves all other characters unchanged.


collapse all

txt = 'Hello, World.';
newTxt = upper(txt)
newTxt = 

Starting in R2017a, you can create string arrays using double quotes instead of the string function.

Convert a string array to contain uppercase characters.

txt = ["The SOONER,";"the BETTER."]
txt = 2x1 string array
    "The SOONER,"
    "the BETTER."

newTxt = upper(txt)
newTxt = 2x1 string array

Text processing functions, such as strfind and regexp, accept string arrays as inputs. Other functions, such as addpath, do not.

Input Arguments

collapse all

Input array, specified as a string array, character array, or cell array of character vectors.


Data Types: string | char | cell


For character arrays, the upper function supports the character sets:

  • PC: Windows® Latin-1

  • Other: ISO® Latin-1 (ISO 8859-1)

For string arrays, the upper function supports Unicode®.

Extended Capabilities

Introduced before R2006a

Was this topic helpful?