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Documentation Help Center. The output, kindicates the starting index of each occurrence of pattern in str. If pattern is not found, then strfind returns an empty array, []. The strfind function executes a case-sensitive search. If str is a character vector or a string scalar, then strfind returns a vector of type double.

If str is a cell array of character vectors or a string array, then strfind returns a cell array of vectors of type double. Since strfind is case sensitive, the pattern is not found. Find the starting indices for occurrences of a pattern in a cell array of character vectors. The pattern wood occurs at indices 10 and 23 in the first character vector and at indices 6 and 28 in the second character vector. Find the occurrences of a pattern in a character vector.

Force strfind to return the indices of those occurrences in a cell array.

matlab find string in array

Then display the indices. Create a character vector and find the occurrences of the pattern ain. To access the numeric array within the cell, use curly braces. Data to be searched, specified as a character vector, a cell array of character vectors, or a string array. Data Types: char cell string. Data Types: char string. Indicator for forcing output to be returned as a cell array, specified as falsetrue0or 1.

Indices of occurrences of patternreturned as an array. If pattern is not found, then k is an empty array, []. If str is a character vector or a string scalar, k is a vector of doubles indicating the index of each occurrence of pattern.

If str is a cell array of character vectors or a string array, k is a cell array. For each piece of text in strthe corresponding cell of k contains a vector of doubles indicating the index of each occurrence of pattern.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I have a struct that holds thousands of samples of data. Each data point contains multiple objects. For example:. If I wanted to find the index number of all the '. However, this doesn't work. The syntax Structure. As Jonas noted, this would work only if there are no fields containing empty matrices, because empty matrices will not be reflected in the concatenation result.

Create String Arrays

If you suspect that these fields may contain empty matrices, either convert them to NaN s if possible In addition, I've thought of another interesting workaround for this using strings. We can concatenate everything into a delimited string to keep the information about empty fields, and then tokenize it back this, in my humble opinion, is easier to be done in MATLAB than handle numerical values stored in cells.

Another answer to this question! This time, we'll compare the performance of the following 4 methods:.

Also, little known fact -- cellfun with one of the possible string arguments is incredibly fast which goes to show how much overhead anonymous functions require Still, if you can be absolutely sure there are no empties, go for EitanT's original answer; that's what Matlab is for. If you can't be sure, just go for the loop.

Learn more. Using find with a struct Ask Question. Asked 7 years, 2 months ago. Active 7 years, 2 months ago. Viewed 53k times. For example: Structure 1. Structure CaptainProg CaptainProg 4, 22 22 gold badges 65 65 silver badges bronze badges. As a side-note: It's much more RAM-efficient and convenient to have structures of arrays i. Jonas but then you couldn't represent "empty" fields. EitanT: Just replace them with NaN s.

Jonas, many thanks; I have now arranged my data into a structure of arrays on your advice. Much more logical : Only caveat is that things could misalign if one of my arrays doesn't contain the same number of elements. But, I make sure they do. Active Oldest Votes. Handling structs with empty fields If you suspect that these fields may contain empty matrices, either convert them to NaN s if possible Eitan T Eitan T Note that this will return wrong indices for fields that come after an empty one.

Jonas I got the impression that there are no empty fields, but you're right. I'll mention that.Sign in to comment. Sign in to answer this question. Unable to complete the action because of changes made to the page. Reload the page to see its updated state. Choose a web site to get translated content where available and see local events and offers.

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Search Support Clear Filters. Support Answers MathWorks. Search MathWorks. MathWorks Answers Support. Open Mobile Search. Trial software. You are now following this question You will see updates in your activity feed. You may receive emails, depending on your notification preferences. Find index of cells containing my string. New on 25 Feb By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You'll have no worries :. Other answers are probably simpler for this case, but for completeness I thought I would add the use of cellfun with an anonymous function.

find a string in a character array

But it returns only first position in strs. Learn more. Ask Question. Asked 8 years, 5 months ago.

Active 3 years, 11 months ago. Viewed k times. Dennis Jaheruddin Benjamin Benjamin 1, 2 2 gold badges 8 8 silver badges 4 4 bronze badges. Note that the current top answer is quite outdated. Make sure to also check this answer. Active Oldest Votes. Vidar Vidar 3, 4 4 gold badges 19 19 silver badges 29 29 bronze badges. Keep in mind this generic solution is good because it works for multiple data types, but it only works for exact matches.

If you need a case-insensitive match, see stackoverflow. If you need to match something more complex like a regex or a field in a structure, see stackoverflow. I feel more safer with str based functions like strcmpi, etc. Pankaj Gupta Pankaj Gupta 1, 7 7 silver badges 6 6 bronze badges. Your solution should be the top one! Yes I agree, this is the best solution, however its just a comparison between andreys and vidars solutions.

So actually andrey should get it. Actually, it should be pointed out that this method doesn't work if you are comparing two arrays of different size i. Vidar's solution does work in that case quite nicelyso is more general.

Asking perf wise. Andrey Rubshtein Andrey Rubshtein Curt Curt 2 2 silver badges 3 3 bronze badges.Sign in to comment. Sign in to answer this question.

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FOR loops in MATLAB: Nested FOR loops

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Find string within cell array. Sasquatch on 6 Oct Vote 0. Commented: Kristoffer Walker on 10 Nov Accepted Answer: Guillaume.

This is probably a dumb question but I can't seem to find anything on google that will allow me to do what I want. All I want to do is check a string against a cell array of strings. Let's say I have something like:. This returns nothing for me, and it makes me put the cell array first. This is checking for string in elements and I want to check for elements in string. If I swap the parameters like:. This works, but I want to check the entire array, and I think a loop in the code will look bad.

Is there any way that I can check to see if any of the stings in my cell array are inside of the sentence?Sign in to comment. Sign in to answer this question.

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matlab find string in array

Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation. Search Answers Clear Filters. Answers Support MathWorks. Search Support Clear Filters. Support Answers MathWorks. Search MathWorks. MathWorks Answers Support.

Open Mobile Search. Trial software. You are now following this question You will see updates in your activity feed. You may receive emails, depending on your notification preferences. Edward Umpfenbach on 13 Sep Vote 1. Commented: Stephen Cobeldick on 29 Jan Accepted Answer: Matt Fig. A is an m x n character array I think that is the right term. It says m x n char in the workspace under value. I want to find a certain row depending on the characters.

So say I have a string s of size 1 x n. I want something like this:. I messed around with ismember instead of strcmp a little too. Can't get it right.Documentation Help Center. String arrays were introduced in Rb. String arrays store pieces of text and provide a set of functions for working with text as data. You can index into, reshape, and concatenate strings arrays just as you can with arrays of any other type. You also can access the characters in a string and append text to strings using the plus operator.

To rearrange strings within a string array, use functions such as splitjoinand sort. Each element of a string array contains a 1-by-n sequence of characters. As an alternative, you can convert a character vector to a string using the string function. Create a string array containing multiple strings using the [] operator. Find the length of each string in str with the strlength function. Use strlengthnot lengthto determine the number of characters in strings. As an alternative, you can convert a cell array of character vectors to a string array using the string function.

matlab find string in array

MATLAB displays strings in string arrays with double quotes, and displays characters vectors in cell arrays with single quotes. In addition to character vectors, you can convert numeric, datetime, duration, and categorical values to strings using the string function. Also, you can read text from files into string arrays using the readtabletextscanand fscanf functions. String arrays can contain both empty and missing values.

An empty string contains zero characters. When you display an empty string, the result is a pair of double quotes with nothing between them "".

The missing string is the string equivalent to NaN for numeric arrays. It indicates where a string array has missing values. Create an empty string array using the strings function. When you call strings with no arguments, it returns an empty string. Note that the size of str is 1-by-1, not 0-by However, str contains zero characters. Create an empty character vector using single quotes. Note that the size of chr is 0-by Create a string array where every element is an empty string.

You can preallocate a string array with the strings function. To create a missing string, convert a missing value using the string function. You can create a string array with both empty and missing strings.

Use the ismissing function to determine which elements are strings with missing values.