Index of indices matlab

and I have my list of indices [2,3], I am looking for a function that will give me back [3,5] which are the values at indices 2,3 in the array 'a'. The straightforward solution is to loop through and index one at a time but I would like to know of a faster more efficient built-in function if one exists. I've talked about logical indexing before in some of the linked posts, but recent work makes me want to show it off again. One of the nice things about logical indexing is that it is very easy and natural to combine the results of different conditions to select items based on multiple criteria.

index of elements. Learn more about indexing. I would get the index of elements of g_vector that have their index in list matrix setted to 0. How can I do? Georg Stillfried (2020). index.m - create a list of the indices and values of an array (https://www.mathworks.com/matlabcentral/fileexchange/  Given two vectors A and B, find the index, idx into A of the element of B so that. A( idx)=B. Now I know there must be many ways it can be done, but is there a  Linear Indexing. What does this expression A(14) do? When you index into the matrix A using only one subscript, MATLAB treats A as if its elements were strung  

24 Aug 2011 we use the parentheses operator to index. It is possible to get a single element, a range of elements, or all the elements. x = linspace(0,pi,10)

Index exceeds matrix dimensions. However, on the left side of an assignment statement, you can specify elements outside the current dimensions. The size of the array increases to accommodate the newcomers. How I can find index of element in array? Follow 8,336 views (last 30 days) 2017 Accepted Answer: James Tursa. I know, that number, for example, 5, is an element in array X, but I don't know it's index. In Python, I can use: X.index(5) I realized this function, using for loop and if statement, but did Matlab doesn't have build-in similar and I have my list of indices [2,3], I am looking for a function that will give me back [3,5] which are the values at indices 2,3 in the array 'a'. The straightforward solution is to loop through and index one at a time but I would like to know of a faster more efficient built-in function if one exists. I've talked about logical indexing before in some of the linked posts, but recent work makes me want to show it off again. One of the nice things about logical indexing is that it is very easy and natural to combine the results of different conditions to select items based on multiple criteria. Finding Indices of Duplicate Values. Learn more about indices, unique The second output is the index of all unique values, e.g. in column 3. (number of repetitions) of a certain value in a vector. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these

Note that when you give a multi-dimensional array as the index into an array (as in the last line of the table above), Matlab will usually convert it to a column vector (it will automatically convert repmatIdx into repmatIdx(:)), except when only one index is provided. When only one index is provided, it will index according to the structure of the multi-dimensional array.

Index exceeds matrix dimensions. However, on the left side of an assignment statement, you can specify elements outside the current dimensions. The size of the array increases to accommodate the newcomers. How I can find index of element in array? Follow 8,336 views (last 30 days) 2017 Accepted Answer: James Tursa. I know, that number, for example, 5, is an element in array X, but I don't know it's index. In Python, I can use: X.index(5) I realized this function, using for loop and if statement, but did Matlab doesn't have build-in similar and I have my list of indices [2,3], I am looking for a function that will give me back [3,5] which are the values at indices 2,3 in the array 'a'. The straightforward solution is to loop through and index one at a time but I would like to know of a faster more efficient built-in function if one exists.

indices = find(X, k) or indices = find(X, k, 'first') returns at most the first k indices corresponding to the nonzero entries of X. k must be a positive integer, but it can be of any numeric data type. indices = find(X, k, 'last') returns at most the last k indices corresponding to the nonzero entries of X. [i,j]

Georg Stillfried (2020). index.m - create a list of the indices and values of an array (https://www.mathworks.com/matlabcentral/fileexchange/  Given two vectors A and B, find the index, idx into A of the element of B so that. A( idx)=B. Now I know there must be many ways it can be done, but is there a  Linear Indexing. What does this expression A(14) do? When you index into the matrix A using only one subscript, MATLAB treats A as if its elements were strung   Learn more about max, indices, index. form an array called 'newData1.data' and then find the row/col indices for each value 1-49 in a vector called 'numbers'. 23 May 2019 of the last match in the matrix: Index=find(a==3,1,'last'). https://in.mathworks. com/company/newsletters/articles/matrix-indexing-in-matlab.html 

the command (hist) counts the frequency (number of repetitions) of a certain value in a vector. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. however, if you use: hist(a,b), then the repetitions are counted against the reference (b). so when you count

Note that when you give a multi-dimensional array as the index into an array (as in the last line of the table above), Matlab will usually convert it to a column vector (it will automatically convert repmatIdx into repmatIdx(:)), except when only one index is provided. When only one index is provided, it will index according to the structure of the multi-dimensional array. From a semantic, or meaning, point of view, MATLAB creates a new temporary array extracting the pieces of vec requested. Following that, the values in the temporary array are assigned to the output newvec . the command (hist) counts the frequency (number of repetitions) of a certain value in a vector. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. however, if you use: hist(a,b), then the repetitions are counted against the reference (b). so when you count [~, sortIndex] = sort(A(:), 'descend'); % Sort the values in descending order maxIndex = sortIndex(1:5); % Get a linear index into A of the 5 largest values Here's a solution that finds the 5 largest unique values, then finds all elements equal to those values (which could be more than 5 if there are repeated values), using unique and ismember : Indexing vectors and arrays in Matlab There are times where you have a lot of data in a vector or array and you want to extract a portion of the data for some analysis. For example, maybe you want to plot column 1 vs column 2, or you want the integral of data between x = 4 and x = 6, but your vector covers 0 < x < 10.

the command (hist) counts the frequency (number of repetitions) of a certain value in a vector. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. however, if you use: hist(a,b), then the repetitions are counted against the reference (b). so when you count the occurrences of each element in (a) against the unique elements of (a), and you find the results that are >2, then you're finding the elements Extract based on indexes: you can define that vector and extract the values let’s say from the third element to the end of the vector: v = 100:105; vExtracted = v(3:end); In MATLAB, you get. Extract based on values: you can define a rule for the extraction inside the parentheses of the vector that is extracted. the command (hist) counts the frequency (number of repetitions) of a certain value in a vector. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. however, if you use: hist(a,b), then the repetitions are counted against the reference (b). so when you count the occurrences of each element in (a) against the unique elements of (a), and you find the results that are >2, then you're finding the elements Note that when you give a multi-dimensional array as the index into an array (as in the last line of the table above), Matlab will usually convert it to a column vector (it will automatically convert repmatIdx into repmatIdx(:)), except when only one index is provided. When only one index is provided, it will index according to the structure of the multi-dimensional array. From a semantic, or meaning, point of view, MATLAB creates a new temporary array extracting the pieces of vec requested. Following that, the values in the temporary array are assigned to the output newvec . the command (hist) counts the frequency (number of repetitions) of a certain value in a vector. if you use: hist(a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. however, if you use: hist(a,b), then the repetitions are counted against the reference (b). so when you count