How to Read Each Character of a String in Matlab
MATLAB - Strings
Creating a character string is quite simple in MATLAB. In fact, we accept used it many times. For example, you type the following in the command prompt −
my_string = 'Tutorials Betoken'
MATLAB volition execute the above statement and return the following result −
my_string = Tutorials Point
MATLAB considers all variables as arrays, and strings are considered as grapheme arrays. Let us use the whos command to check the variable created to a higher place −
whos
MATLAB will execute the in a higher place statement and render the following upshot −
Name Size Bytes Form Attributes my_string 1x16 32 char
Interestingly, you can use numeric conversion functions similar uint8 or uint16 to catechumen the characters in the string to their numeric codes. The char part converts the integer vector dorsum to characters −
Example
Create a script file and type the post-obit code into it −
my_string = 'Tutorial''s Betoken'; str_ascii = uint8(my_string) % viii-bit ascii values str_back_to_char= char(str_ascii) str_16bit = uint16(my_string) % 16-chip ascii values str_back_to_char = char(str_16bit)
When you run the file, it displays the following issue −
str_ascii = 84 117 116 111 114 105 97 108 39 115 32 80 111 105 110 116 str_back_to_char = Tutorial's Betoken str_16bit = 84 117 116 111 114 105 97 108 39 115 32 eighty 111 105 110 116 str_back_to_char = Tutorial'southward Indicate
Rectangular Graphic symbol Array
The strings we have discussed so far are one-dimensional grapheme arrays; however, we demand to store more than than that. We need to store more dimensional textual information in our program. This is achieved by creating rectangular character arrays.
Simplest fashion of creating a rectangular character array is by concatenating two or more i-dimensional graphic symbol arrays, either vertically or horizontally equally required.
Y'all tin can combine strings vertically in either of the following ways −
-
Using the MATLAB concatenation operator [] and separating each row with a semicolon (;). Please note that in this method each row must contain the same number of characters. For strings with different lengths, you should pad with infinite characters as needed.
-
Using the char part. If the strings are of different lengths, char pads the shorter strings with trailing blanks so that each row has the same number of characters.
Example
Create a script file and blazon the following code into it −
doc_profile = ['Zara Ali '; ... 'Sr. Surgeon '; ... 'R N Tagore Cardiology Enquiry Eye'] doc_profile = char('Zara Ali', 'Sr. Surgeon', ... 'RN Tagore Cardiology Research Centre') When you lot run the file, it displays the following effect −
doc_profile = Zara Ali Sr. Surgeon R Due north Tagore Cardiology Research Center doc_profile = Zara Ali Sr. Surgeon RN Tagore Cardiology Inquiry Center
Yous can combine strings horizontally in either of the following means −
-
Using the MATLAB concatenation operator, [] and separating the input strings with a comma or a space. This method preserves any trailing spaces in the input arrays.
-
Using the string concatenation function, strcat. This method removes trailing spaces in the inputs.
Example
Create a script file and type the following lawmaking into information technology −
name = 'Zara Ali '; position = 'Sr. Surgeon '; worksAt = 'R N Tagore Cardiology Inquiry Center'; profile = [name ', ' position ', ' worksAt] contour = strcat(name, ', ', position, ', ', worksAt)
When y'all run the file, it displays the following upshot −
profile = Zara Ali , Sr. Surgeon , R N Tagore Cardiology Research Center profile = Zara Ali,Sr. Surgeon,R N Tagore Cardiology Inquiry Center
Combining Strings into a Cell Array
From our previous discussion, information technology is articulate that combining strings with different lengths could be a pain equally all strings in the array has to be of the same length. Nosotros have used blank spaces at the stop of strings to equalize their length.
However, a more efficient way to combine the strings is to convert the resulting array into a cell array.
MATLAB cell array tin can hold different sizes and types of information in an assortment. Cell arrays provide a more flexible manner to store strings of varying length.
The cellstr function converts a character array into a cell array of strings.
Example
Create a script file and type the following code into it −
name = 'Zara Ali '; position = 'Sr. Surgeon '; worksAt = 'R North Tagore Cardiology Enquiry Center'; contour = char(name, position, worksAt); profile = cellstr(profile); disp(contour)
When y'all run the file, information technology displays the post-obit result −
{ [1,i] = Zara Ali [2,1] = Sr. Surgeon [3,1] = R Due north Tagore Cardiology Research Middle } String Functions in MATLAB
MATLAB provides numerous cord functions creating, combining, parsing, comparing and manipulating strings.
Following table provides cursory description of the string functions in MATLAB −
| Part | Purpose |
|---|---|
| Functions for storing text in grapheme arrays, combine character arrays, etc. | |
| blanks | Create cord of blank characters |
| cellstr | Create cell assortment of strings from grapheme array |
| char | Convert to character assortment (cord) |
| iscellstr | Decide whether input is prison cell array of strings |
| ischar | Determine whether particular is character assortment |
| sprintf | Format data into cord |
| strcat | Concatenate strings horizontally |
| strjoin | Join strings in cell assortment into single cord |
| Functions for identifying parts of strings, find and replace substrings | |
| ischar | Determine whether item is character array |
| isletter | Assortment elements that are alphabetic messages |
| isspace | Array elements that are space characters |
| isstrprop | Determine whether string is of specified category |
| sscanf | Read formatted data from string |
| strfind | Find i string within another |
| strrep | Detect and replace substring |
| strsplit | Split string at specified delimiter |
| strtok | Selected parts of string |
| validatestring | Check validity of text string |
| symvar | Determine symbolic variables in expression |
| regexp | Lucifer regular expression (case sensitive) |
| regexpi | Friction match regular expression (case insensitive) |
| regexprep | Supplant string using regular expression |
| regexptranslate | Interpret cord into regular expression |
| Functions for string comparison | |
| strcmp | Compare strings (case sensitive) |
| strcmpi | Compare strings (case insensitive) |
| strncmp | Compare offset due north characters of strings (case sensitive) |
| strncmpi | Compare offset north characters of strings (instance insensitive) |
| Functions for irresolute string to upper- or lowercase, creating or removing white space | |
| deblank | Strip trailing blanks from end of string |
| strtrim | Remove leading and trailing white space from string |
| lower | Catechumen string to lowercase |
| upper | Convert string to uppercase |
| strjust | Justify character array |
Examples
The following examples illustrate some of the above-mentioned string functions −
Formatting Strings
Create a script file and type the following code into it −
A = pi*1000*ones(1,5); sprintf(' %f \n %.2f \n %+.2f \n %12.2f \n %012.2f \north', A) When you run the file, it displays the following result −
ans = 3141.592654 3141.59 +3141.59 3141.59 000003141.59
Joining Strings
Create a script file and blazon the following code into it −
%cell array of strings str_array = {'red','blue','green', 'yellow', 'orange'}; % Join strings in cell array into unmarried string str1 = strjoin(str_array, "-") str2 = strjoin(str_array, ",") When you run the file, information technology displays the following outcome −
str1 = red-blueish-green-yellow-orange str2 = ruby,blue,green,yellow,orange
Finding and Replacing Strings
Create a script file and type the following lawmaking into it −
students = {'Zara Ali', 'Neha Bhatnagar', ... 'Monica Malik', 'Madhu Gautam', ... 'Madhu Sharma', 'Bhawna Sharma',... 'Nuha Ali', 'Reva Dutta', ... 'Sunaina Ali', 'Sofia Kabir'}; % The strrep function searches and replaces sub-string. new_student = strrep(students(8), 'Reva', 'Poulomi') % Display commencement names first_names = strtok(students) When you run the file, it displays the following issue −
new_student = { [1,1] = Poulomi Dutta } first_names = { [1,1] = Zara [1,2] = Neha [1,iii] = Monica [1,four] = Madhu [1,5] = Madhu [1,vi] = Bhawna [i,vii] = Nuha [1,8] = Reva [i,9] = Sunaina [one,x] = Sofia } Comparing Strings
Create a script file and blazon the following code into it −
str1 = 'This is test' str2 = 'This is text' if (strcmp(str1, str2)) sprintf('%s and %due south are equal', str1, str2) else sprintf('%s and %southward are not equal', str1, str2) finish When yous run the file, it displays the following result −
str1 = This is examination str2 = This is text ans = This is exam and This is text are not equal
Useful Video Courses
Video
Video
Video
Video
Video
Video
Source: https://www.tutorialspoint.com/matlab/matlab_strings.htm
0 Response to "How to Read Each Character of a String in Matlab"
Post a Comment