Matlab extract index from array. I would be so glad if you can please help me.

Matlab extract index from array. I have a 2D-array of positions imported from workspace. Any idea? for k = 1:length(vector) newVector = vector( exluding index k); <---- what mask should I use? % other operations to do with the newVector end Learn more about matrix, matrix array, extraction, loop MATLAB I have a random matrix containing values from 1-50 of length 1000. Web browsers do I know there are already a lot of questions about this topic out there. Set Index column to 3 and Output Size column to 2. For example, you can use unique(A(:,vars)), where vars is a positive integer, a vector of positive integers, a variable name, a cell array of variable names, or a logical vector. EDIT: Adding an example I have an array [2; 3] and a matrix [ 1 3 4 5; 2 4 9 2]. If a is an narray of size 1x5. csv' I have a data array with numbers and NaN elements. I would like to get 3 vectors with the indices and the respective values of the non-NaN elements of this array. I'm currently trying to extract the indexes from a cell array of an EEG experiment and I used the ismember function to line up with the labels and extract the index number of the bad channels, but it didn't give me the results instead of Is there an easy way to extract every nth element of a vector in MATLAB? Say we have x = linspace(1,10,10); Is there a command something like y = nth(x,3) so that y = 3 6 9? Matlab: Extracting Nth element of a matrix, while maintaining the original order of matrix How viable are index funds for non-retirement investing? Use uniquetol to find unique floating-point numbers using a tolerance. Based on your location, we recommend that you select: . csv' 'avf201312. I have a PxMxN array that I want to convert in a PxK 2D array. Now i want to find max index values in another cell and extract those values( matrix 1*2, here i want to extract only 1st col value only). Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! I will wildly speculate that you have a cell array in which each element is a cell array that contains a string. Look at the sub2ind method to understand more: matlab copy one array and propagate into many arrays. a(1:2) % gives first two arrays . MATLAB Language Fundamentals Data Types Numeric Types Logical. You can use max() to get the max value. I now need to write a general program to extract the k Create a timeseries object, and extract the second and third data samples. 15 from the row 'data{1,1}(:,5)'. 1. I would like to extract only the real numbers from an array containing imaginary numbers also I would like to eliminate the imaginary numbers from array. Learn more about arrays, indexing MATLAB I have an array of variable dimensions and want to extract a slice of it. If pat occurs multiple times in str, then newStr is str from the first occurrence of pat to the end. To find the index of the element in the array, you can use the find() function. If pat occurs multiple times in str, then newStr is str from the start of str up to the first occurrence of pat. I try to find a highly generalized way to extract numerical data from cell arrays containing char. Find more on Logical in Help Center and File Exchange. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! Hello, I have two questions. 2. But all solutions are for certain cases. In many cases logical indexing suffices and Randomly select number and its index from an array in matlab (2 answers) Choose elements from array randomly in matlab and store the remain element (2 answers) Closed 2 years ago . Therefore, from an array of 10 elements, of which 5 real, and 5 imaginary, to obtain an array of only 5 elements, which must be the real numbers element. This is what I was looking for. Use uniquetol to find unique floating-point numbers using a tolerance. Set Index column to [1 3 5]. To get this, assign the result of the call to max to a two element vector instead of just a single variable. For instant, I wanted to get the values and indices of the elements which falls within the range 0. I would be so glad if you can please help me. This is a good answer. To extract the third and fourth elements of dimension 2, use Starting Index (dialog). for ex. a(2:4) iwant = a(1:3)*3 ; % pick first three and multiply by 3 3 Comments. extract value is 6(1st col) similarly all other row I will wildly speculate that you have a cell array in which each element is a cell array that contains a string. Copying part of a matrix to another empty matrix with the same indices. I managed it to do it with a loop, but since I'm working with much larger arrays, I You can extract the even indices and odd indices at one stretch without loop. I have tried just using it as A(B) but it returns all the values as a single column with the reaction times, and I would like the output to be another array with the The "min" and "max" functions in MATLAB return the index of the minimum and maximum values, respectively, as an optional second output argument. If str is a string array or a cell array of character vectors, then extractAfter extracts substrings from each element of str. csv' 'wrrrt201009. iwant_even = k(2:2:end) ; % odd index values. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! Extracting index from cell array. Learn more about find index, array, string In MATLAB Online öffnen. Select a Web Site. Find the index of given value in an array. Tags matlab; matrix; Community Treasure Hunt. For example, consider the 4-by-4 matrix A : A = [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16] Accepted Answer: Mehmed Saad. I want to increment the count to access the next element from array once a robot has reached this position. Similarly, a(6) is 2, a(7) is 4 etc. How can I extract the number of non-zero elements in a matrix or in an array? 2. For example, to access a single element of a matrix, specify the row number followed by the column number of the element. So I'm trying to extract an array of substrings, for example: 'a1' 'b1' 'c1' 'd1' When the subscript index refers to only one element, MATLAB's syntax allows to use parentheses (()) after the curly braces and further extract a sub-array (a substring in your case). k = rand(1,10) ; % even index values. In your first call to find you input an array the same size/dimensions as A. Choose a web site to get translated content where available and see local events and offers. If str is a string array or a cell array of character vectors, then the function extracts substrings from I have a matlab cell array whose members look like: 'abc201301. So passing it into size() or length() would not reshape it. EDIT: Adding an example To slice a cell array and get a cell array output, you should use round parenthesis. If str is an array with multiple pieces of text, then endPos can be a numeric scalar or numeric array of the same size as str. This is the command you To find the index of the element in the array, you can use the find () function. csv' 'sdfdf201101. Learn more about find index, array, string Open in MATLAB Online. In the second call to find you've performed some logical indexing on A and are only passing in a column vector that contains the non-NaN elements of A. Learn more about find index, array, string Abrir en MATLAB Online. This in MATLAB. Now I would like to extract the second element from the first row and the third element from the second row and thus obtain [3 ; 9]. You can also reference multiple elements See more If a cell contains an array, you can access specific elements within that array using two levels of indices. Extracting a 2 dimensional array from a 3 Learn more about matlab, matrix . csv' 'wfeef201406. ts = timeseries((1:5)'); tsdata = getdatasamples(ts,[2,3]) tsdata = 2×1 2 3 Input Arguments. I am looping through a vector with a variable k and want to select the whole vector except the single value at index k. The struct has 5 fields, one which is called "name". I know A(1,:,:) or B(1,:,:,:) can both extract their elements along the first dimension. The function returns Suppose A is multi-dimensional array (MDA) of size 3,4,5 and B is another MDA of size 3,4,5,6. Example data: lines = <779x88 char> (post-processed textscan data) xtotal= 0. You can use indexing to access the elements of the array. csv' 'sdffdsd201305. I need to extract a 2D matrix from SM of order 10x181. Open in MATLAB Online. I have a cell which contains max and its index values in each row. 95< x <1. In MATLAB, the arrays are used to represent the information and data. First, use curly braces to access the contents of the cell. Learn more about multidimensional array, logical index . 0000E+00 etotal= 0. [M,I] = [2,295]. If you look at my code you'll see that z is exactly what you've passed into the second find. Run the command by entering it in the MATLAB Command Window. K has to be obtained from a logical matrix MxN. If I the size of the array was fixed I would like to do: result = G(:,:,:,r,:,:); But in my case, r is a variable and s In MATLAB, the arrays are used to represent the information and data. Learn more about array I have an array: x=[8,5,5,5,9,4,3,2,9,10] I would like to create a new array but only with values less than 7. a(end) % gives last element . g. How can I get These in a vector? Select a Web Site. 0000E+00 xtotal= Extracting index from cell array. I want to extract first 30 numbers of 10-20 to put in another matrix. I have an n-value structure array with multiple fields, and want to extract a specific field (all values thereof are (1x4) single arrays) into a nx4 array. If str is a string array or a cell array of character vectors, then extractBefore extracts substrings from each element of str. . Editing my original post to the following effect: there are multiple field in the structure array, and I'm only looking to extract 1 of them to How to extract indices with a condition?. Learn more about extract array subset, variable dimension MATLAB when e. newStr = extractBefore(str,pat) extracts the substring that begins with the first character of str and ends before the substring specified by pat. I am looking to solve this Question: Write a function called top_right that takes two inputs: a matrix N and a scalar non-negative integer n, in that order, where each dimension of N is greater than or equal to n. I now need to write a general program to extract the k I would like to extract only the real numbers from an array containing imaginary numbers also I would like to eliminate the imaginary numbers from array. I have 3x3 (3d) array which is % use the indexes array to extract 3 elements at each index in the largeArray to yield: How to extract certain values from an array. The trouble is that the data is messy, and ideally I would write some expressions that neatly extract the important newStr = extract(str,pat) returns any substrings in str that match the pattern specified by pat. Using the find () function you can find the indices and the element from the array. Matlab: Copy a Extract 2D array from 3D array using logical index. Learn more about indices, vector, condition, bool hi Mr M. However, this syntax is prohibited when the comma separated lists contains @Jigg: Yes. The most common approach is to explicitly specify the indices of the elements. In MATLAB the array indexing starts from 1. csv' 'ffgewgfw201106. a(1) % gives first . Learn more about interpolation, find, array I want to extract both temperature and time for elements starting at 2017,4,15,00,00,00 and ending at 2017,4,30,23,50,00. Which means, you could even use a single index and say: b = a(1:3); Since the first 3 elements ARE 1,3,5. For I want to extract only the numerical information, and turn this into a new table. Hi. 3. 0000E+00 ztotal= 0. Is there a command to call the elements all at once by specifying a list of index pairs? Something like: I was told by a Mathworker that (:) does not reshape the array into a column vector. 295 index value of its max value in certain row, let say (6,26321) is the extracted index value in another cell. Here is how I I have a given matrix of let's say 4x4. The find () function MATLAB provides several effective methods for finding the index of a value in an array, each catering to different needs and scenarios. e is the element in the 3,2 position (third row, second column) of A. extract value is 6(1st col) similarly all other row Extracting index from cell array. So I have a cell array B of size 4*101 in which each cell contains an array of size 1*3, like this: B = cell ( [4 101]); for i MATLAB has many string array functions that return logical arrays, such as contains, startsWith, and matches. To find unique rows in tables or timetables with respect to a subset of variables, you can use column subscripting. A word of advice, avoid using for loop as much as possible in MATLAB, make use of vectorization instead. selecting all elements in the 2nd dimension and the first element of all remaining dimensions of an array, for a 3-dimensional array one would write: A(1,:,1) how to program this elega I have a cell which contains max and its index values in each row. To extract the first eight elements of dimension 4, use is there a command in Matlab, which returns the last value of a vector? In R is this command called "tail". If I the size of the array was fixed I would like to do: result = G(:,:,:,r,:,:); But in my case, r is a variable and s newStr = extractBefore(str,pat) extracts the substring that begins with the first character of str and ends before the substring specified by pat. The find() function stands out as a When you want to access selected elements of an array, use indexing. Then, use the standard It will be useful if you have [row,col] indices stored in a 2-column matrix, and if you want to extract those elements from your matrix, without the for loop. The max function can also return the index of the maximum value in the vector. I'm currently trying to extract the indexes from a cell array of an EEG experiment and I used the ismember function to line up with the labels and extract the index number of the bad channels, but it didn't give me the results instead of just Extracting a 2 dimensional array from a 3 Learn more about matlab, matrix . Khyati - why would it matter if the array contains complex numbers? Or is there a particular structure to your array in that the first element is the real part of number A, the second element is the complex part of number A, etc. I'm currently trying to extract the indexes from a cell array of an EEG experiment and I used the ismember function to line up with the labels and extract the index number of the bad channels, but it didn't give me the results instead of just Hi, I would like to get the value and index of elements from a cell array. I'm currently trying to extract the indexes from a cell array of an EEG experiment and I used the ismember function to line up with the labels and extract the index number of the bad channels, but it didn't give me the results instead of Extracting index from cell array. For example, the following code produces a row vector 'M' that contains the maximum value of each column of 'A', which is 3 for the first column and 4 for the second column. Suppose A is multi-dimensional array (MDA) of size 3,4,5 and B is another MDA of size 3,4,5,6. ? Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! newStr = extractAfter(str,pat) extracts the substring that begins after the substring specified by pat and ends with the last character of str. To do this, Find the treasures in MATLAB Central and discover how the community can Extracting index from cell array. Learn more about structure arrays MATLAB. You can use these to operate on text using logical indexing. For example: X = [1, 2, 3, 4] and I need a command which Hi. i just wondering about the value that you're searching index for (42), isn't that related to the quiz of rigid body kinematics course (Concept Check 9 - Euler Angle Differential Kinematic Equations) on coursera! Find the treasures in Read about MATLAB array indexing, instead of asking very simple basic questions. 3414E-03 ytotal= 0. To extract the first, third, and fifth element of dimension 3, use Index vector (dialog). The function returns Extract 2D array from 3D array using logical index. One of its configurations is that the selection index can be passed in via an input port. I'm currently trying to extract the indexes from a cell array of an EEG experiment and I used the ismember function to line up with the labels and extract the index number of the bad channels, but it didn't give me the results instead of just I want to extract the values from the first array using the second as an index. He said that if you assign that End position, specified as a numeric array. I have a 3D matrix named SM of order 17x10x181. To extract all of the elements of dimension 1, use Select All. Example: extractBetween(str,5,9) extract the substrings from the fifth through the I got the following Problem: I got a struct Array and want to extract one field from that struct in a vector. C1 = C(1,:); With cell arrays, parentheses will return a subset of that cell array as a cell array, while curly braces will unpack whatever is "inside" the element(s) you're indexing. How can I get the indices of the following combinations: For example if I have the matrix: 'row odd and column odd' would be the indices I want to extract the elements A(1,1) and A(2,2). Using the find() function you can find the indices and the element from the array.