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xplore29


Active since 2012

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communication engineer
Professional Interests: signal processing

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How to reduce number of entries in legend
I am plotting 9 curves from the following 9 vectors. r_t1 , g_t1 , b_t1 r_t2 , g_t2 , b_t2 r_t3 , g_t3 , b_t3 M...

10 years ago | 1 answer | 0

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Question


index info for CAT
I am concatenating vectors x1,x2,x3 using y=cat(2,x1,x2,x3). Each one of these vectors have different lengths. I need to keep tr...

10 years ago | 1 answer | 0

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Question


problem saving a variable
I am running a long simulation that runs a for loop. For each run of a loop, I save a variable in the same folder. To see where ...

10 years ago | 0 answers | 1

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Question


how to remove axis labels from IMAGESC
I am creating heat map of 2d matrix using following figure; rand('twister',1); X = randn(10,10); imagesc(X); th...

11 years ago | 1 answer | 1

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Question


Generating trellis structure for ISI channel
I need to create trellis for a dummy channel = [1 4 6 4 1]. Matlab command poly2trellis can be used for generating trellis struc...

11 years ago | 0 answers | 0

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Question


Assigning value to an element in vector
The problem is trivial but the code does not work. I wanted to replace 1 by -1 in a matrix ip = [0 1 1 0;0 0 0 1] X=find...

11 years ago | 1 answer | 0

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Question


how to create rectangular checkerbox matrix
I need to create M as follows M=[1 0 1 0;0 1 0 1;1 0 1 0 ] where m=size(M,1);n=size(M,2) My code should take m,n as inp...

11 years ago | 1 answer | 0

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Question


Naming Variable from input arguments
My function takes two input arguments Dim,Snr I want to name my variable based on these two arguments in the following manner ...

11 years ago | 2 answers | 0

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answers

Question


loading and accessing cell array
I had a Table cell of dimension 6x32x32. I saved it in my folder using save('Table.mat','Table') In another function I loaded i...

11 years ago | 1 answer | 0

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Question


using FIND in 3D matrix
I am trying to find the 3rd dimension index value for the following case A(:,:,1)=[1 2 ; 3 4] A(:,:,2)=[9 8 ; 4 4] A(:,:,...

11 years ago | 3 answers | 0

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answers

Question


how to keep track of input entries used to compute output for conv2(.)
I am using conv2(.). I needed to keep track of index of input elements which were used to compute a particular output element. I...

11 years ago | 0 answers | 0

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Question


selecting neighborhood in 2D matrix
I have a 2D matrix A and a mask M with a pivot element at location (i,j). I need to select a neighborhood of an entry of A at (p...

11 years ago | 1 answer | 0

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answer

Question


How to track indices of a matrix after a transformation
I have a mxn matrix A that is transformed in some way to formulate B. The transformation can either be simple rotation or some o...

11 years ago | 3 answers | 0

3

answers

Question


How to fix a pivot element in a MASK to some particular entry in an Image and compute SubImages
I have a binary mxn matrix called Image. I have a pxq mask which has a pivot pixel as well. I want to apply this mask to the ima...

11 years ago | 0 answers | 0

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Question


Problem with returning cell array
I am working with nested functions. In one of the functions I have declared a cell array and have done all assignments according...

11 years ago | 0 answers | 0

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Question


log likelihood ratio to probability measure
For BPSK, one can theoretically move back and forth between log-likelihood ratio and probabilities by using following expression...

11 years ago | 1 answer | 0

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Question


dimension mismatch error in for loop
Following is the overview of my problem for i=1:iterations compute XYZ end Each computation of XYZ is independent ...

11 years ago | 1 answer | 0

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Question


Multi Dimensional Cell Array
Can we create a single multi-dimensional cell array of variable size dimensions. I have matrices (all of same dimensions) A...

11 years ago | 2 answers | 0

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answers

Answered
parfor indexing and order
Although I am not using parfor for variable display purpose but I am curious to know that if I try to display the variable like ...

11 years ago | 0

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Question


parfor indexing and order
[a,b,c]=size(Mask); % a=b=c=3; parfor i=1:size(Mask,3) i end I was expecting to see i=1,i=2,i=3 in a sequen...

11 years ago | 2 answers | 0

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answers

Question


combinations of a matrix.....
I am trying to find an command/algorithm which gives me all possible translates of a given matrix that has fixed #a,#b, and #c. ...

11 years ago | 1 answer | 0

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answer

Question


switch statement to select a function
I have select one out of four functions, decided by the value of variable named "Indicator", which can be applied to a matrix Y ...

11 years ago | 1 answer | 0

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Question


dynamic naming using eval(.)
I am creating new matrices in a loop IP = IP_count(:); x=IP_count_length; for i=1:IP_count_length ...

11 years ago | 2 answers | 0

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Question


unique rows of matrix
I have to create new matrix A from a given matrix B in the following manner B=[1 4 2;1 5 2;1 5 2;3 3 4;3 1 4;2 1 3;2 6 3] ...

11 years ago | 2 answers | 0

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Question


Prob Matrix for binary sequence
for some integer 'n', I have a matrix M of size (2^n) x n containing all possible binary sequences. Another vector N of length '...

11 years ago | 1 answer | 0

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answer

Answered
Autocorrelation Matrix from a vector
Thank you. In case of cross correlation between y(nx1) and x(mx1) (n>m) vectors rxy is a nxn matrix and following code sho...

12 years ago | 0

Question


Autocorrelation Matrix from a vector
I have observations of a noisy channel and i form a vector y of length n from those observations. I need to compute the autocorr...

12 years ago | 2 answers | 0

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answers

Answered
finding primitive element of GF(2^m)
correction: b=a(1); %picking the first root of primitive polynomial for testing for i=1:q-2 f(i)=mod(b^i,q-1); ...

12 years ago | 0

Question


finding primitive element of GF(2^m)
Hi How can I find the primitive element (field generator) of a GF(2^m) where q=2^m. The following code gives the roots of ...

12 years ago | 1 answer | 0

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Question


Binary channel implementation
hi.....How can one implement a binary memoryless channel in matlab if the channel transition matrix is know? what is the relatio...

13 years ago | 0 answers | 0

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