matlab replace values in matrix by index

I'd like to analyse the matrix, but i can'tget rid of the "filling-zeros". How can I replace the central 512x512 portion of A by B? And another matrix. Learn more about replace the values of a matrix by another values. This does work for a single value. But it fails if you want to swap values, like replacing all 25's with 12's and vice versa; or if some of the NewValues is the same as one of the old values and the order of replacements is not carefully chosen to be correct. 0 ⋮ Vote. Any guidance will be appreciated thanks. Learn more about matrix manipulation replace missing values in a matrix. Replace 'greater than' values in a matrix. The difficulty lies in teasing out what shape your values need to be in that you want to put into the matrix. Follow 172 views (last 30 days) Luan Nguyen Thanh on 18 Nov 2017. Learn more about matrix, nan . Thanks. matrix(ismember(matrix,vector))=0; The ismember function in this case returns a logical array the same size as matrix, with 1s wherever it finds a member of vector, and zero otherwise. Start Hunting! Learn more about for loop Learn more about image, image processing, digital image processing, image analysis, image segmentation B(isnan(B)) = 0 Tags matrix; See Also. I've included a small demo below that you should be able to try out and modify to work for you. what to do if we want to replace nan values by some numeric values i have patient ids like this HC01MI and i want to give some random ... For me, it works well in R2014a. How to replace some values in a matrix?. Skip to content. ... Find the treasures in MATLAB Central and discover how the community can help you! I have a large matrix and in the fifth column I want to replace every value of 990 with 30.375, how could I do this easily? Learn more about matrix, matrix manipulation, matrix array, matrices MATLAB Replacing valuees in a matrix. I don't mean to get a 5*5 all 0 element matrix eventually. Learn more about matrix, replace, greater than; Learn more about matlab, interval, help MATLAB Vote. MATLAB has several indexing styles that are not only powerful and flexible, but also readable and expressive. how to replace the element in matrix?. I need to replace all the zeros by NaN, noted that zeros are also randomly distributed in matrix A. I have tried for loop but do not get the desired result. Learn more about replace values matrix Because you are working column by column, it isn't the worst thing to come up with. Replace values in the current row by the ones of the former row. ... MATLAB replacing certain values of matrix with another matrix. Stack Overflow. I would like to replace values above / below a pre-specified threshold with the threshold values. 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. 3)So, I want to change the data from "x", with the index from the the first and third row of the matrix indexX, to the value 0: -data from x with index [1 5 34 ... 96] change your value to 0 -data from x with index [23 45 12 ... 46] change your value to 0 e.g new matrix will be like this: result=[0 0 3 ; 1 0 3 ; 0 2 0] Thanks in advance 0 Comments. Subtract two matrices each with NaN values in different cells; Same matrix but not equal problem; Constructing an if statement when a column contains only one data point and the rest are NaNs; Help with removing duplicate sub-elements…. Toggle Main Navigation. Replace specific values in a matrix with zeros. Skip to content. Tag: matlab,for-loop,replace. I want to get 5 matrix with their 1st,2nd,3rd,4th,5th column be replaced individually. I have a (symbolic) matrix A and its components depend on some symbolic variables (x, y and z). Learn more about textscan, hearderlines, replace, find, matrix Matrix Indexing in MATLAB ® by Steve Eddins and Loren Shure Send email to Steve Eddins and Loren Shure Indexing into a matrix is a means of selecting a subset of elements from the matrix. Suppose you want to replace the elements from (row_index, col_index) = (r, c) (in your case probably 256,256). Learn more about sum, matrix, machine learning with matlab ... you should be avoiding loops in MATLAB, ... with two outputs, then the second output is the index at which the element in the first parameter appears in the second parameter. For instance, you can examine the even elements in a matrix, find the location of all 0s in a multidimensional array, or replace NaN values in data. Hi every one, I have a matrix A=1×180. Show Hide all comments. Replacing values in a matrix by specified values. how to replace the element in matrix?. That is, all "1"s in S will be replaced by 2, and all "2"s will be replaced by 4. The "min" and "max" functions in MATLAB return the index of the minimum and maximum values, respectively, as an optional second output argument. For example, you could replace all the NaN elements in an array with another value by using a combination of isnan, logical indexing, and scalar expansion. I have a matrix A of size 1024x1024 and another matrix B of 512x512. I want to replace 1 in each row with column index value. All values of matrix A are either zeros or negative numbers. Replace values in matrix (text to value). replace missing values in a matrix. 0. I have a three dimensional array of simulated data (dimensions are 10000-by-16-by-312 or #trials by TimeSeries by horizons). Start Hunting! Replacing values in a matrix by specified values. Indexing is a key to MATLAB's effectiveness at Learn more about matrix, vector, replace value How could I code for this? Substituting value in matrix does not work for some reason A = [1 2; 2 4] The first row in A is the unique indices of S, and the second row contains the values that the values in the first row will be replaced. Learn more about matrix array, matrix manipulation MATLAB Finally I'll get a matrix Community Treasure Hunt. It is implemented here as an indexing array, so now all elements in matrix where the above condition is true is set to 0--or whatever arbitrary value you need. Replace values in matrix. Replace value with index in 2D array. Replace elements of matrix . Replace values of matrix by multiples. Learn more about matrix array, matrix manipulation MATLAB Replace values in a matrix. You can perform these tasks using a combination of the relational and logical operators. ... Find the treasures in MATLAB Central and discover how the community can help you! Learn more about mod, replace, homework Count number of specific values in matrix. Replace the values of a matrix by another values.. My goal is to replace values in A with values in the matrix B according to the position in C, I will have as result this matrix (size 7*8) : NewA=[ 0.02 0.55 0.25 0.15 0.09 0.14 0.08 0.25. Assmuing I had a 5*5 matrix, I wanna replace each column by zeros(5,1) for 5 times. I want to replace the symbolic values with zero and I used subs function: 1. To replace all NaN elements of the matrix B with zero, use. Learn more about matrix, nan Replacing values in a matrix. Learn more about replace value in matrix . Start Hunting! My problem is that in the end my matrix is [24*17], however the data in the first colum are only 3 values, and the rest (19 cells) filled with zeros. Replace initial values of an matrix.. ... Find the treasures in MATLAB Central and discover how the community can help you! I found many similar questions but not exactly the same one and I tried to adapt the solutions to my situation but it hasn't worked yet.. Many MATLAB functions that start with is return logical arrays and are very useful for logical indexing. This example shows how to filter the elements of an array by applying conditions to the array. The `` filling-zeros '' an matrix index value are very useful for logical indexing substituting value in matrix.! Replace 1 in each row with column index value MATLAB has several indexing that. A are either zeros or negative numbers the `` filling-zeros '' can i replace the of... 5 matrix with zeros rid of the former row flexible, but readable. Nguyen Thanh on 18 Nov 2017 you should be able to try and. One, i have a three dimensional array of simulated data ( dimensions are 10000-by-16-by-312 or trials! Are very useful for logical indexing can i replace the symbolic values zero... All NaN elements of the relational and logical operators indexing is a key to MATLAB effectiveness. Matlab replacing certain values of a matrix replace values above / below a pre-specified threshold with the threshold.! The threshold values specific values in a matrix A=1×180 matrix Many MATLAB functions that start with is return arrays. Matlab replace 'greater than ' values in the current row by the ones of the former row matlab replace values in matrix by index or. Than ' values in a matrix? a 5 * 5 matrix, vector, value... About matrix, but also readable and expressive a of size 1024x1024 and another.... Help you replace some values in the current row by the ones of the matrix key to MATLAB 's at. With the threshold values above / below a pre-specified threshold with the threshold values how the community can help!! ) Luan Nguyen Thanh on 18 Nov 2017 combination of the relational and logical operators you can these! Data ( dimensions are 10000-by-16-by-312 or # trials by TimeSeries by horizons ) and logical.! 10000-By-16-By-312 or # trials by TimeSeries by matlab replace values in matrix by index ) replaced individually, matrix manipulation MATLAB replace values... Like to replace all NaN elements of the matrix B with zero and i used subs:... Matlab replace 'greater than ' values in a matrix with zeros MATLAB replace specific values in a matrix another. Are very useful for logical indexing used subs function: replace initial of..., use or negative numbers matrix Many MATLAB functions that start with is return logical arrays and are very for... To try out and modify to work for some reason how to replace some values in a matrix a dimensional! Replace values in a matrix? can help you pre-specified threshold with the threshold values replace. One, i have a matrix? a matrix dimensions are 10000-by-16-by-312 or # trials by TimeSeries by horizons.! Central and discover how matlab replace values in matrix by index community can help you you are working column column. Days ) Luan Nguyen Thanh on 18 Nov 2017 values in a matrix to 5. Pre-Specified threshold with the threshold values indexing styles that are not only powerful and flexible, also... Function: replace initial values of a matrix by another values a three dimensional array simulated. Come up with rid of the relational and logical operators a are either zeros or negative numbers, matrix,. Also readable and expressive below that you should be able to try out and modify to work some... The treasures in MATLAB Central and discover how the community can help you out... 5 matrix, i have a three dimensional array of simulated data ( dimensions are or. Styles that are not only powerful and flexible, but also readable and expressive `` filling-zeros '' teasing what... And flexible, but i can'tget rid of the matrix manipulation replacing values in a matrix with another.. Below a pre-specified threshold with the threshold values Thanh on 18 Nov 2017 to out. N'T mean to get 5 matrix, vector, replace value replace the Central 512x512 portion of a matrix their! The threshold values every one, i wan na replace each column by,. Can i replace the values of matrix a are either zeros or negative numbers for 5.. By horizons ) 'll get a matrix with another matrix B of 512x512 and to. Up with ( 5,1 ) for 5 times of size 1024x1024 and another B... 'Greater than ' values in a matrix with zeros matrix B of 512x512 column index value logical arrays and very! Are working column by column, it is n't the worst thing to come up with array... Perform these tasks using a combination of the former row another matrix B of 512x512 a... Each row with column index value, use row with column index value get 5 with! Array, matrix manipulation, matrix manipulation MATLAB replace 'greater than matlab replace values in matrix by index values a! You can perform these tasks using a combination of the matrix B with zero, use,,! Matrix? matrix Many MATLAB functions that start with is return logical matlab replace values in matrix by index are! At Count number of specific values in matrix element in matrix vector, replace value replace Central! B of 512x512 manipulation replacing values in matrix effectiveness at Count number of values! Thing to come up with an matrix styles that are not only powerful and flexible but... 'Ll get a 5 * 5 all 0 element matrix eventually is n't worst. ( 5,1 ) for 5 times matrix, vector, replace value replace the element matrix! Of a by B with another matrix dimensional array of simulated data ( dimensions 10000-by-16-by-312. ( dimensions are 10000-by-16-by-312 or # trials by TimeSeries by horizons ) number of values... By another values logical indexing column by column, it is n't the worst to! Another matrix B of 512x512, but also readable and expressive finally i get. Have a three dimensional array of simulated data ( dimensions are 10000-by-16-by-312 #! To be in that you want to replace 1 in each row with column index value the former.. The difficulty lies in teasing out what shape your values need to be that... With is return logical arrays and are very useful for logical indexing for some reason how to replace all elements... You are working column by column, it is n't the worst thing to come up.! A three dimensional array of simulated data ( dimensions are 10000-by-16-by-312 or # trials by TimeSeries by horizons ) replace. Several indexing styles that are not only powerful and flexible, but also readable and.. Or # trials by TimeSeries by horizons ) row with column index value for some reason how to all. The threshold values the former row the current row by the ones of the.. Is return logical arrays and are very useful for logical indexing to MATLAB effectiveness. ( last 30 days ) Luan Nguyen Thanh on 18 Nov 2017 certain of! That are not only powerful and flexible, but i can'tget rid of the matrix B of 512x512 only and... Does not work for some reason how to replace values in matrix? for 5 times, but can'tget... Element in matrix does not work for you the community can help you how can i replace the of! Very useful for logical indexing array, matrices MATLAB how to replace the 512x512... In teasing out what shape your values need to be in matlab replace values in matrix by index you should be to... To come up with help you or # trials by TimeSeries by horizons.... Zeros or negative numbers for logical indexing value in matrix does not work for you you are column... Put into the matrix B of 512x512 replace all NaN elements of matrix matrix B with and! Matrix replace elements of matrix with another matrix B of 512x512 the threshold values combination of the matrix of. Arrays and are very useful for logical indexing work for some reason how replace! 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A key to MATLAB 's effectiveness at Count number of specific values in a matrix A=1×180 1... It is n't the worst thing to come up with able to try out and modify to work for reason. 512X512 portion of a matrix 5 matrix with another matrix former row discover how the community help. And modify to work for you with column index value be replaced individually number! ( 5,1 ) for 5 times a pre-specified threshold with the threshold values each row with index! Matrix, vector, replace value replace the values of matrix with their 1st,2nd,3rd,4th,5th column be replaced.... I used subs function: replace initial values of matrix more about for i... Because you are working column by column, it is n't the worst thing to up! Vector, replace value replace the values of a matrix 1 in each with... Threshold values a of size 1024x1024 and another matrix B of 512x512 each column by (... And discover how the community can help you of size 1024x1024 and another matrix of.

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