Return variable name as string matlab torrent

Each of those strings that are variable names are variables whos values are arrays and id like to concatenate whatever variables do exist. Matlab switches into the scope of the function, getting ready to execute the code inside it. Return control to invoking script or function matlab. Yo can use pietros answer or strcat but i find sprintf to be a lot more readable for this. Matlab considers all variables as arrays, and strings are considered as character arrays. Apr 25, 2012 convert cell to string, or assign variable. How do you a string in a variable as a name for another variable. If you call the script or function that contains return directly, there is no invoking program and matlab returns control to the command prompt. Matlab input string as variable name or other ways. How do i dynamically generate a file name for save in matlab. I have a variable called headings, inside it is a bunch of text time, speed, distance. Learn more about variables, strings, matlab function, file matlab. Assign value to variable in specified workspace matlab.

To return a variable in matlab you just assign into one of the specified return parameters. Hello all, how do you a string in a variable as a name for another variable. Convert cell to string, or assign variable matlab answers. The reason i want the name of a variable is i dont want to hard code the name of a variable into a save command like this. Nov 01, 2011 when you are a beginner it seems like a cunning and fast way to store information, but actually it is really bad practice to name your variables dynamically. Construct valid variable name from string matlab genvarname.

See example 6, below the variable name returned by. How to convert a string into a variable learn more about string to variable. Hi, for the student version of matlab simulink, can one license be used under multiple os on the same machine. Unlike the contains or strfind functions, the order of the input arguments to findstr is not important. Selected parts of strings matlab strtok mathworks benelux. In matlab, how can i get a string containing grumpy given the following declaration. Oct 17, 2008 hello all, how do you a string in a variable as a name for another variable. This may seem like a waste of time as it would be quicker to type ab1 each type rather than evaluating text, but i will be copying the same code multiple times and i want to only change text each time rather than the names of all the variables. For example, who regexp mon tues lists only the variable names in the. Apr 12, 2012 how to convert a string into a variable. The maximum length of a variable name is the value that the namelengthmax command returns. This matlab function returns the name or value of the specified parameter for. Valid variable names can include letters, digits, and underscores.

This can be useful if you are not certain which of the two input arguments is the longer one. Return control to invoking script or function matlab return. Assign value to variable in specified workspace matlab assignin. Value of variable, specified as a scalar or array value. How to print string or variable in plot title learn more about title, string, plot, filename, store matlab. Feb 21, 2012 eval takes a string argument and executes it as code. Sometimes can be easier than trying to work thru the eyestrain sure to result from the doubleup exercise. However, it takes some effort to know what parts of the example give this particular behavior.

I will study about structures and tables in matlab as soon as i will have time to do it, for the moment i was. Create string array with no characters matlab strings. Aug 31, 20 i think the only way to really do it is from the answer from the question you cited. How to reference variable using string with the same name. This matlab function returns the workspace variable name, s, corresponding to the argument number argnumber. Examples functions release notes pdf documentation. Specify the function who in exclusions to create a variable name that will be unique in the current matlab workspace see example 4, below. Using strings as variable names in a for loop matlab. If so, is there a limitation of running it under one os at a time. Adopt string arrays as a text data type in your own code, following these guidelines. What is the best way to get the name of a variable in a. I am trying to output a variable, along with string. Matlab get string containing variable name stack overflow. List variables in workspace, with sizes and types matlab whos.

If the size of any dimension is 0, then str is an empty array if the size of any dimension is negative, then strings treats it as 0. There is an example of this with the modal dialog example in guide. Function handles connect your code with any matlab function regardless of the current scope. String functions a complete reference of all of matlabs string functions can be obtained by typing help strfun at the matlab prompt. This is usually called reflection in other programming languages, but i cannot find an examp. How to return the values of variables in gui matlab. I had more trouble trying to decipher the string you were trying to build than i cared to try to fight thru. Its also a lot more flexible as you can have strings, characters, numbers, currencies, etc. Using this, you can create a short function that, given a variable, will output the name of it as a string, as in the following example.

Learn more about workspace, variable, evalin, save, function. Construct valid matlab identifiers from input strings matlab. How do i create variable names from string variables matlab. Matlab matrix laboratory is a multiparadigm numerical computing environment and proprietary programming language developed by mathworks. Headings time, speed, distance now, i want to have a variable that uses the text inside headings as. It is of course necessary to check that the input string is the name of a variable before executing it, as the example on that page shows but without telling the user that theyve done something wrong. Use string variable as variable name physics forums.

Matlab switches out of the scope of the function, and passes the. The byte counts returned by this command represent the number of bytes data occupies in the matlab workspace, and not in the file the data was. Hi, for the student version of matlabsimulink, can one license be used under multiple os on the same machine. Insert variable name into string matlab answers matlab. If the value of the variable requires evaluation, matlab evaluates the expression in the function that contains the call to assignin, not in the workspace specified by ws. When str2func is used with a character vector representing an anonymous function, it does not have access to the local function. Learn more about dynamic, string, save, fileio matlab. If str is a string array or cell array of character vectors, genvarname returns a string array or cell array of character. Oct 29, 2015 using strings as variable names in a for loop. Follow 2,106 views last 30 days osminbas on 12 apr 2012.

Please follow the permalink at the bottom of this post to see the correct video we are working on this. I have entered the following commands on matlab command window and its working. Since its name is not a valid matlab identifier, use parentheses and. The syntax typically, each function should be placed in its own m. So concatenating strings was what i could think about to be able to make the script work only with the input of the folder name, and not changing the variable in the script. How can i get a variable name to include a specified. This matlab function returns a string with no characters. How can a put a variable into a text string matlab answers. Learn more about string to variable, string, variable matlab.

I think it would have been better if they had used a different datatype name to avoid confusion. Specify varname as character vector or string scalar. I wrote this code to be extensible to an arbitrary set of fields, so i think that additional id elements with corresponding values in data should work fine. You must use the functional form of whos when there is an output argument. First, strtok ignores any leading whitespace in str. Variable name, specified as a character vector or string scalar. Follow 222 views last 30 days mohammad on 17 sep 2011. If the size of any dimension is 0, then str is an empty array if the size of any dimension is negative, then strings treats it as 0 beyond the second dimension, strings ignores trailing dimensions with a size of 1. Determine if input is valid variable name matlab isvarname. If s is a valid matlab variable name the isvarname function returns logical 1 true. Jan 03, 20 using a matlab string as a valid variable name.

Headings time, speed, distance now, i want to have. This matlab function lists in alphabetical order the names of all variables in the currently active workspace. The invoking program is a script or function that calls the script or function containing the call to return. Choose a web site to get translated content where available and see local events and offers. A valid variable name begins with a letter and contains not more than namelengthmax characters. How can i get the name of a matlab variable as a string. Learn more about gui, variable, callback, uiobject. Creating strings strings are matrices with character elements.

Let us use the whos command to check the variable created above. Any string that exceeds namelengthmax is truncated in the varname output. The latter shows a temporary variable to shorten the building a little if need more than just one. If str is a string array or cell array of character vectors, genvarname returns a string. Jun 04, 20 how to store string into an array learn more about string, array. Create the following function in a folder on your matlab path. You must use the functional form of who when there is an output argument. You cannot define variables with the same names as matlab. How to call a variable with user string input matlab. I think the only way to really do it is from the answer from the question you cited. Potential variable name, specified as a character vector, or string. Then, strtok starts at the first character that is not whitespace, and includes all characters up to, but not including, the next whitespace character. It shows how to store, split, and sort text, and how to compute and.

Tables store each piece of columnoriented data in a variable. In matlab, is there a simple way to convert the name of a variable to a string. Any leading and trailing blanks in either input argument are explicitly included in the comparison. Im looking for something similar in principle to num2str. The normal rules of assignment and variable creation apply.

Dec 28, 20 the latter shows a temporary variable to shorten the building a little if need more than just one. This example shows how to analyze text data with string arrays. Is there a function that can return the length of a string. I would like to convert the name of my matlab variable to a string so that, for example, i can plot a variable and then use the name of the variable as a title for.

Field names that you reference with expressions are called dynamic fieldnames, or sometimes dynamic field names. Dec 04, 2008 how can i output a variable and string in matlab. Variable name of function input matlab inputname mathworks. Headings time, speed, distance now, i want to have a variable that uses the text inside headings as its name with 1,2,3,4 inside.

Because this might look confusing in the code, especially if you want to insert more quotes, i prefer. Pass string as variable into function matlab answers. Not recommended find string within another, longer. Im looking for something similar in principle to num2str and str2num.

How do i save variables from a function to the base workspace. My points are no stronger than what the documentation states, which is the dynamically accessing variables is slow, buggy, and complex. Many beginners in programming struggle with the problem of hiding indices in the names of variables, because they do not have enough experiences with the. Input a variable into a plot title matlab answers matlab.

This short video shows how to convert variable values to strings. Therefore, matlab calls the builtin randi function, and returns a. This is needed for making titles, xlabels, ylabels and other functions that expect a string for input. Learn more about variable, string, title, plot, input, variable string, plot title, title variable, plot variable. The elements returned by genvarname are guaranteed to be different from each other. Matlab allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages. All i have done is read a lot of discussions, documentation, and blogs on this topic, and collected them together into one list for anyone who wants to learn how to write efficient matlab code. I had a well formed question from an advanced matlab user recently. Name of matfile, specified as a character vector or string scalar.

Oct 28, 2016 how can a put a variable into a text string. Field names that you reference with expressions are called dynamic fieldnames, or sometimes dynamic field names for example, create a field name from the current date. This matlab function assigns the value val to the variable var in the workspace ws. Assigning data to variable names in a vector during. Return id associated with variable name matlab qvarid. I will study about structures and tables in matlab as soon as i will have time to do it, for the moment i was looking only for a workaround. May, 2014 how to call a variable with user string input. Learn more about table, variable, references, horrible idea matlab. Do you have an additional field in id that is called date or similar. Matlab is also not intended for this kind of variable naming. How to convert a variable name to a string in matlab quora.

How do i create variable names from string variables. As a part of gui example in matlab help, how could i return the value of the variable contents. Or, how do i assign a file name to a variable, but keep it a string. After that the script will go into that folder and load positiveinstancesc1. The output has the same number of dimensions as the input, s.

Table array with named variables that can contain different types. The simplest way to create a string is to use it on the left side of an equal sign where the right side of the equal sign is an expression that evaluates to a string. Instead, assign the handle to a variable and use that variable name to specify a block. When i type a variable in command window, it shows that the variable is not valid. A valid matlab variable name is a character string of letters, digits, and underscores, such that the first character is a letter, and the length of the string is less than or equal to the value returned by the namelengthmax function. To index into a table, use smooth parentheses to return a subtable or curly.