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Don't create one variable per player. The output did not truly average the pixel values within the image (at least it didn't appear to do so. In terms of thought process, it is easier for me to grasp utilizing a dynamic variable to store the images for averaging. . If you want to create variables programmatically (not a recommended practice, but if you insist), see the previous question: A way to dynamically create variables in Matlab?. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against . How to give a dynamic variable name in for loop? The problem I have is that I cannot convert the string to a variable name and with an array it would not work, as I would have to convert all variable names to an array . I have variable with name x with varying size of some 10000*2. My .mat file are all different name, such like 2011_003260, 2011_003255 and bla bla bla, as you can see, it is not a continuous number, and not a string, so, how can i loop it with a for loop? I want the Matlab workspace variable to display as the file name. I must assign values to them afterwards but since I do not know how many variables will be created because of max (uv) I have to obtain variable names on the left dynamically e.g. How to give a dynamic variable name in for loop? 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. . How to use a string as name for variable/array?. Can you please explain more on how to use a cell array or a struct data type for dynamic variable names? However when you use more appropriate storage for your data (and meta-data) then you will suddenly find lots of MATLAB functions that do many useful . So every iteration there would a new variable created from the cell string value. Note that both creating variable names dynamically and accessing variable names dynamically suffers exactly the same problems: slow, inefficient, more liable to bugs, much harder to debug. labelX {1,1}=imgtemp {1,1}; X should be dynamically assigned. The above code will automatically name the fields of struct. m on the "Final Project" page or copy and paste into MATLAB, seeing it in MATLAB is easier to read! mat is a MATLAB library of Chemical Reaction Optimization (CRO). Hi! Also note that once you start defining/accessing variable names dynamically then you force yourself into writing the rest of your code inefficiently, because for the rest of the code you will have to use the . Learn more about variable, name, loop MATLAB. I would create a struct with one field per player and store vectors in those fields (you can use dynamic field names to refer to the field if you have a char vector containing the name of the field) or a table array with one table variable per player. Also note that once you start defining/accessing variable names dynamically then you force yourself into writing the rest of your code inefficiently, because for the rest of the code you will have to use the . If this code had been written better** using basic indexing then the location of any syntax errors would get highlighted by the MATLAB Editor, and the code would be much easier to debug. As I say, it's messy to do that, and at least you may want to have things stored within a structure, which allows programmatic creation of elements using string variables and dynamic referencing using the paren syntax. When creating a MATLAB function, the name of the file should match the name of the first function in the file. That method requires an approximation to the displacement function w in the form of w(x)=sum(c(i)*phi(i)), where c(i) are constants (but unknown in . Assign values to variables in a loop. In MATLAB 6.5 (Release 13), we introduced dynamic field references into MATLAB. probably the dynamic field names for structures is a reasonable alternative although often it's better to simply leave the values in the array and use the column indices as the selector. The way variables work in matlab, they shadow functions of the same name. Learn more about variables statement, for loop, eval, dynamic variable names Image Processing Toolbox I want to sort each class from this main . Jan on 24 Apr 2017 × antipattern buggy dynamic variable names eval evil saving variable inside for loop with auto naming slow ugly. I have a number of variables (for example timeoffset0 - timeoffset20 and receivedpoweroffset0 - receivedpoweroffset20). Below will learn all the Find funct MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. You should never name variables nor structs dynamically. I have to create a series of variable using a "for" loop to associat it with a TF in order to draw Bode diagram for each delay,I tried this but it didn't work: Also another reason is I need to provide a progressive and transparent series of user friendly variables that my Professors can understand what they mean without reading every line of my code. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. Although you imagine that by using dynamic variable names "I can't make any mistakes copying code" in fact these are the cause of beginners bugs that are almost impossible to debug. However, because code in an eval statement can change at run time, it is not compiled.. Code within an eval statement can unexpectedly create or assign to a variable already in the current workspace, overwriting existing data.. Concatenated character vectors within an eval statement are often difficult to . Hello. I would like to use a cell array string value as a variable name in a for loop. I'm currently solving linear static analysis problem using the Ritz method. This is much more robust, faster, and neater than trying to mess around with awful, hacky, buggy dynamic variable names. Skip to content. I have a 4500x3 sized matrix. MATLAB: How to save variable with different name inside loop. Learn more about symbolic, variables, matlab, array, for loop, subs, dynamic variable names MATLAB 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. also is it posible the change/append some text to the variable name each iteration. However, I did get the code posted by Matt to function as a 4D array. how can i declare variables in for loop. So, I am sorry if I am going to make mistakes. What you can do is to name fields dynamically. 2 columns are fix, row value changing. Don't create one variable per player. So whoever wrote that code chose an approach which forces the user into writing slow, complex, buggy code which is hard to debug. anti-pattern dynamic variable names inefficient slow variables. Functions. I was using this to let a user set the name of a variable: eval([var2n '=' num2str(var2v)]); where var2n is the string entered by the user - Can you please explain more on how to use a cell array or a struct data type for dynamic variable names? This is not an ideal way to name your variables. Jan on 24 Apr 2017 × Generating the variable name from user input, particularly, is asking for trouble. Now that you are already aware of the problem with using eval to create variable names dynamically, a better approach is to use cell arrays; however, if you want to link filenames to the data, then use a struct. You find a bunch of posts related to the avoidance of eval in this forum. Valid function names begin with an alphabetic character, and can contain letters, numbers, or underscores. I was using this to let a user set the name of a variable: eval([var2n '=' num2str(var2v)]); where var2n is the string entered by the user - there's always a way to avoid creating variable names dynamically. I have a 4500x3 sized matrix. Learn more about strings, table, char, loop, anti-pattern, eval, dynamic variable names, slow, complex, buggy I would like to plot all of these variables within a loop or similar method so that I can write a script which will plot all of the variables for any number of variables that are given as an input. Generate Variable Names with a Loop. in a loop. I want to sort each class from this main . First two columns of the matrix contains the x and y value of the data set and third column contains the class labels as a numeric value like 7,3,1 sizes of the classes are not same and changing accourding to the user input. my knowledge of Matlab is limited, I admit it. The Test Manager has a variable called "test" (under custom criteria) which I am saving off. There is always a better solution. HomeworkQuestion. This is equivalent to the question, how to use a hammer to push a screw into a piece . It would be much better to collect the As in an array and access (for a column vector) A(:,1) instead of A_1, A(:,2) instead of A_2, etc.One advantage of doing it this way is that if you ever need to iterate over all of the A variables, you can simply loop over the indices of the columns. Note that both creating variable names dynamically and accessing variable names dynamically suffers exactly the same problems: slow, inefficient, more liable to bugs, much harder to debug. For instance: for k = 1:10. The output did not truly average the pixel values within the image (at least it didn't appear to do so. Hope this helps. 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. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. In GUI, you select with the CheckBox the variables you want to plot. . First two columns of the matrix contains the x and y value of the data set and third column contains the class labels as a numeric value like 7,3,1 sizes of the classes are not same and changing accourding to the user input. However, if you want to change the variable names you can use sprintf or strcat to form a string that will be your command and then use eval (cmdString) For example: yy = num2str ('1998') % you loop would go over the years. MATLAB ® compiles code the first time you run it to enhance performance for future runs. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. Therefore it is strongly recommended to avoid such dynamic variable access, see: FAQ: How to create variables A1, A2, . load ('i I would recommend putting the data into cell arrays and looping through the data set. You could for example store method1-3 in one struct (let's call it data), and access its via dynamic field names: Dynamic variable names result in obfuscated, buggy, and slow code: why bother? I define another variable (also vector 101x1), named new_input. Is there a lookup function in matlab? Creating symbolic variables with dynamic names with a for loop. my knowledge of Matlab is limited, I admit it. In addition, MATLAB supports dynamic field names (field look-ups by name, field manipulations, etc.). It is imported from the input_consigne_egal_mesure; on the second line of my code (below). What are they and why should you use them? As long as the file is included on the MATLAB path, you can use the function in the following way: >> x = 1:10; % example data. A. 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. The GUI doesn't accept it and I've only been using matlab for less than a week so I haven't learnt how to call the NN function yet in the script. Matlab: In for loop, change name of variable. Dynamic labelling is a bad ides., Instead you define your vectors I to a matrix and access them. Matlab is a tool and you can use it the wrong way. Your variables will be stored in a struct, which will be nice. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. Before using dynamic variable names, try reading and understanding why it is a really bad idea, and read all of the links and references on all of the linked pages. Now, I would like to write input_reec_PGC1 = new_input. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. I name variables dynamically in loop within a function: so, I get variables label1, label2, label3,. Note that both creating variable names dynamically and accessing variable names dynamically suffers exactly the same problems: slow, inefficient, more liable to bugs, much harder to debug. Besides of that, I would like to save the information in my .mat file into a table, is there any way I can do it? Also note that once you start defining/accessing variable names dynamically then you force yourself into writing the rest of your code inefficiently, because for the rest of the code you will have to use the . In MATLAB, there are 3 basic types of arrays, traditional ones where you index using parentheses () , cell arrays where you can address the contents using curly braces {} , and structures (known in MATLAB as the type struct . I have a variable (vector of size 101x1) in a for loop, named input_reec_PGC1. As a rule of thumb, never store meta data as part of the variable name if you intend to access it via a loop. @Vladislav Kargin: Exactly. 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: function out = getVarName (var) out = inputname (1); end. I would create a struct with one field per player and store vectors in those fields (you can use dynamic field names to refer to the field if you have a char vector containing the name of the field) or a table array with one table variable per player. This can degrade the speed substantially - I've seen a factor of 100. So if the user decides to name your variable plus, that's addition broken in the rest of your program, name it eq and it's comparison that's broken. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. (sprintf ('RandomVariable_%d', k)) = rand; end. Slow: The conversion itself is fast, but it will slow down Matlab, because the JIT acceleration cannot work efficiently afterwards: Loops will suffer, when the type of the used variables cannot be identified uniquely. 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 efficient using of arrays. The output did not truly average the pixel values within the image (at least it didn't appear to do so. For example, Direct lookup tables are efficient to implement on hardware because they do not require any calculations. In terms of thought process, it is easier for me to grasp utilizing a dynamic variable to store the images for averaging. In terms of thought process, it is easier for me to grasp utilizing a dynamic variable to store the images for averaging. The object in study is a beam. However, I did get the code posted by Matt to function as a 4D array. However when you use more appropriate storage for your data (and meta-data) then you will suddenly find lots of MATLAB functions that do many useful . However when you use more appropriate storage for your data (and meta-data) then you will suddenly find lots of MATLAB functions that do many useful . - beaker Before using dynamic variable names, try reading and understanding why it is a really bad idea, and read all of the links and references on all of the linked pages. MATLAB is also not intended for this kind of variable naming: if you continue to include data in the variable names then you will find yourself fighting many more of these battles against MATLAB. I think its much easier to look at the code and see what i'm trying to acomplish. One can name variables for these columns as mnemonic aids if desired. The loop I am trying to do takes the chosen boxes and prints the image of them in their respective folders. 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. A better approach would be saving them in a structure by using a for loop. I can save it off under its own unique file name but when I load it back into Matlab's workspace, it is loaded as "test". However, I did get the code posted by Matt to function as a 4D array. I have to create a series of variable using a "for" loop to associat it with a TF in order to draw Bode diagram for each delay,I tried this but it didn't work: MATLAB: Dynamic Variables in Loop. I name variables dynamically in loop within a function: so, I get variables label1, label2, label3,. So, I am sorry if I am going to make mistakes. labelX {1,1}=imgtemp {1,1}; X should be dynamically assigned. Will automatically name the fields of struct equivalent to the avoidance of eval this. Should be dynamically assigned below ) auto naming slow ugly '' https: //uk.mathworks.com/matlabcentral/answers/35295-how-to-convert-a-string-into-a-variable '' terrorb.group. Rand ; end however, I am sorry if I am sorry if I am to! 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