I have a matrix of larger 4x4, and I have a smaller matrix of 2x2 and their respective row and column positions in the larger matrix. I want to assign the elements of the smaller matrix to the larger matrix on that specific row and column positions with out using any loop, I am doing so, im = zeros(4,4) r=[1 2; 3 4] c=[1 2; 3 4] indices = sub2ind(size(im),r,c); im1=ones(2,2) im(r, c)=im1(:) but it gives exception of, "Subscripted assignment dimension mismatch". any help in this regard will be appreciated.

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8/22/2014 12:20:16 PM

On 8/22/14, 2:20 PM, javed iqbal wrote: > I have a matrix of larger 4x4, and I have a smaller matrix of 2x2 and their respective row and column positions in the larger matrix. I want to assign the elements of the smaller matrix to the larger matrix on that specific row and column positions with out using any loop, I am doing so, > > im = zeros(4,4) > r=[1 2; 3 4] > c=[1 2; 3 4] > indices = sub2ind(size(im),r,c); > im1=ones(2,2) > im(r, c)=im1(:) > but it gives exception of, > "Subscripted assignment dimension mismatch". Try im(indices)=im1(:) HTH, Christopher

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8/22/2014 12:52:19 PM

Christopher Creutzig <Christopher.Creutzig@mathworks.com> wrote in message <53F73D03.7060102@mathworks.com>... > On 8/22/14, 2:20 PM, javed iqbal wrote: > > I have a matrix of larger 4x4, and I have a smaller matrix of 2x2 and their respective row and column positions in the larger matrix. I want to assign the elements of the smaller matrix to the larger matrix on that specific row and column positions with out using any loop, I am doing so, > > > > im = zeros(4,4) > > r=[1 2; 3 4] > > c=[1 2; 3 4] > > indices = sub2ind(size(im),r,c); > > im1=ones(2,2) > > im(r, c)=im1(:) > > but it gives exception of, > > "Subscripted assignment dimension mismatch". > > Try > > im(indices)=im1(:) > > > > HTH, > > Christopher Thanks Christopher, it can be acheived using the syntex im(indices)=im1;

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8/25/2014 7:59:09 AM

I have a matrix: ================== x=1.0 A=[1, x, x^2+1 x, 5*x, x^3 7*x, 3, cos(x)]; ==================== for example, I only want to calculate specific elements in A, say when x=1.0,need calculate A(1,2) and A(2,3), while when x=2.1, need calculate A(2,3), A(1,3). Is there any command in matlab can do this or some other way instead of calculating all the elements then pick the specific elements? Thanks!!! "Jim Chen" <yzarcc@hotmail.com> wrote in message news:eed097c9.0409210906.2b4168cd@posting.google.com... >I have a matrix: > ================== > x=1.0 >...

How can I prevent MATLAB from showing matrix's elements when the mouse is beside that matrix's name? Thanks Zeinab Ghofrani On Sun, 30 May 2004 01:52:31 -0400, "Zeinab Ghofrani" <zghofrani@yahoo.com> wrote: >How can I prevent MATLAB from showing matrix's elements when the >mouse is beside that matrix's name? Open the preferences. Goto editor/debugger / Display and deselect "enable datatips in edit mode". Lars Lars Gregersen COMSOL A/S http://www.comsol.dk ...

I have a difficulty in using Matlab to create a matrix. The matrix have its element is a random function of time-varying valuable t such as Gaussian or Sin. When t changes the matrix is changed and my system will use this matrix to calculate. My example: A is a square matrix 3,3. A(1,1) = 2 sin(t), A(1,2)=1 sin(t), A(1,3)= 3cos(t). A(2,1) = 1 cos(t),A(2,2) = 3sin(t), A(2,3) = 2cos(t). A (3,1)= 0.5sin(t),A(3,2) = 1.5sin(t),A(3,3)=3sin(t). A will be changed when t is running. So how I can matrix A to calculate. Please help me about Matlab code. Thanks. "Viet Dang" <muapho...

Hi, I am trying to create a matrix which has a matrix as each element e.g.: h=[1:3]' h(1)=[1,2;3,4] I then get this message which is understandable: ??? In an assignment A(I) = B, the number of elements in B and I must be the same. Is there a way to do this though? Thanks in advance. "Dave Brackett" <davebrackett@hotmail.com> wrote in message <g5i9f9$eoo$1@fred.mathworks.com>... > Hi, I am trying to create a matrix which has a matrix as > each element e.g.: > > h=[1:3]' > h(1)=[1,2;3,4] > > I then get this message which is understan...

I have a difficulty in using Matlab to create a matrix. The matrix have its element is a random function of time-varying valuable t such as Gaussian or Sin. When t changes the matrix is changed and my system will use this matrix to calculate. My example: A is a square matrix 3,3. A(1,1) = 2 sin(t), A(1,2)=1 sin(t), A(1,3)= 3cos(t). A(2,1) = 1 cos(t),A(2,2) = 3sin(t), A(2,3) = 2cos(t). A (3,1)= 0.5sin(t),A(3,2) = 1.5sin(t),A(3,3)=3sin(t). A will be changed when t is running. So how I can matrix A to calculate. Please help me about Matlab code. Thanks. you can use a loop and a timer to...

reduce 80*80 sigular matrix to a 72*72 full rank matrix oasis wrote: > reduce 80*80 sigular matrix to a 72*72 full rank matrix delete linear dependent rows/columns steffen --=20 Steffen Brueckner brueckner@sbrs.net http://www.sbrs.net ISD Uni Stuttgart How to find the linear dependent column/row > How to find the linear dependent column/row i am not sure why you want to do that, one way would be : [U,S,V]=svd(A80); idx=find(diag(S)>1e-15); A72=U(idx,idx)*S(idx,idx)*V(idx,idx)'; but i think you should have a careful look to orth, null and related functions before you do ...

Hi! I am trying to make a function which is to find a certain number, or numbers above a threshold number, in a given matrix of unknown size. Preferably without any other function then if,else,while,for. function search = searchMatrix(matrix) search = []; [r c] = size(matrix); for i = 1:r for j = 1:c if (matrix(i,j) >= 2000) search = matrix(i,j) && i && j; end end end But I would like the numbers, and the location of the numbers to be put into a new matrix "search" with each new row correspondi...

Hi guys, I am writing an image registration package, and hence need to insert an image (matrix of doubles) into a larger matrix at a specific position as calculated by my algorithm. I tried using matrix indexing to insert, but just got 'array subscript mismatch' errors, so i am using a loop to individually allocate pixels and it just eats up CPU time. What i want is something like: insert_row % Row insertion position insert_col % Column insertion position sub_rows % Rows in smaller matrix sub_cols % Columns in smaller matrix larger_matrix( insert_row : insert_row + sub_r...

I was wondering if anybody know how matlab accesses the elements of a vector/matrix. Will it take matlab longer time to access two nonproximate elements of a vector than two proximate ones ? Let's say I were to access the elements for each iteration in a for loop "for i=1:n ....", where n is a large number. Is it at all worth thinking about making some structure such that the elements accessed in each iteration becomes proximate in some way ? Or will this not be important for the speed of matlab ? Sincerely, -Stein "Stein Grongstad" <sgrongst@math.uio.no> wr...

How I can put time value like 10:23:34 in a matrix cell. Like below: a(1,2)= 10:23:34 Regards "M" wrote in message <kehbrk$3pp$1@newscl01ah.mathworks.com>... > How I can put time value like 10:23:34 in a matrix cell. Like below: > a(1,2)= 10:23:34 One approach is to use a cell array and have the entry be a string. E.g., a = cell(1,2); a{1,2} = '10:23:34'; James Tursa On 2/1/2013 3:46 PM, James Tursa wrote: > "M" wrote in message <kehbrk$3pp$1@newscl01ah.mathworks.com>... >> How I can put time value like 10:23:34 in a ...

Hi everbody. First of all, I apologize for my English, so please be indulgent with me if my sentences are not grammatically correct. I have some trouble with MATLAB. I have some data in txt files that I catch like that : MFS93A1 = textread('Z:/Fichiers/MFS93.A1.txt','','headerlines',1); MFS93B1 = textread('Z:/Fichiers/MFS93.B1.txt','','headerlines',1); MFM77A1 = textread('Z:/Fichiers/MFM77.A1.txt','','headerlines',1); MFM77C1 = textread('Z:/Fichiers/MFM77.C1.txt','','headerlines',1); Then, in or...

Greetings to you all! I have two matrices: Matrix_W=[P,N] Matrix_X=[4*P,N] I want to perform a multiplication between the [i,j]-th elements of W and the [4*i-3 : 4*i , j]-th ranges of elements of X. and end up with a [4*P,N] matrix. I there a way to quickly perform such an operation without having to endure the overkill of a double for-loop? Thank you in advance. "George Antonopoulos" <georanto@gmail.com> wrote in message news:htj3cp$har$1@fred.mathworks.com... > Greetings to you all! > > I have two matrices: > Matrix_W=[P,N] > Matrix_...

Hi, I need help! I want to construct a matrix 10x10 where every element is a matrix ?x2. After, I need to extract the ?x2 matrix by the 10x10. how to make that? mirus wrote: > Hi, I need help! > > I want to construct a matrix 10x10 where every element is a matrix > ?x2. > > After, I need to extract the ?x2 matrix by the 10x10. > > how to make that? have a look at cell arrays. they provide the possibility to store arbitrary data in an array like fashion. michael Michael Wild wrote: > mirus wrote: >> Hi, I need help! >> >> I want to constru...

Hello, a)I need to create an M*M matrix of all zeros, except for one row on ones in the center. M in the matrix will vary from 16, 32,64,128. b)I need to repeat the above for two rows of ones.Here the two rows of ones should be seperated by four rows of zeros. Thank you, athina shah wrote: > Hello, > > a)I need to create an M*M matrix of all zeros, except for one row on > ones in the center. > > M in the matrix will vary from 16, 32,64,128. it will be pretty difficult, since you can not create the rows number 7.5, 15.5 and so one > b)I need to repeat the above ...

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