# tiwwexx

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**Content Feed**

Question

Why is my parfor loop running slower than a regular for loop

Hello all, I have a 3D array that takes an SVD of the first two dimensions for the size of the 3rd dimension. This seems like it...

2 månader ago | 1 answer | 0

### 1

answerQuestion

How to efficiently index into memory and call functions within for loops

Hello all, I have a code that I would like to speed up a little bit. There's one section where I input an array that has multipl...

3 månader ago | 1 answer | 0

### 1

answerQuestion

Automatically set number of outputs of the gradient function

I have a loss function I define to minimize some gradient magnitude. However, the dimension of my input data will change so I wa...

6 månader ago | 1 answer | 0

### 1

answerQuestion

Complex matrix multiplication with pagemtimes

I'm optimizing some function and I end up having to do voxelwise quadratic matrix multiplication a'Ba on complex mats. While tes...

8 månader ago | 1 answer | 0

### 1

answerQuestion

limiting broadcast variables in parfor loops

I have some 3D or 4D arrays that I want to run a block processing on. To do this I create a cell object that I can call that ret...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

limiting broadcast variable in a 3d block processing program

I have some 3D or 4D arrays that I want to run a block processing on. To do this I create a cell object that I can call that ret...

mer än ett år ago | 0 answers | 0

### 0

answersQuestion

Optimize GPU code with nested pagemtimes

Hello all, I'm trying to speed up computation using the GPUs that are available to me. Right now I have two arrays, Q and W. ...

mer än ett år ago | 1 answer | 0

### 1

answerSpeed up a for loop by utilizing a gpu

This solution was given by Jan here. Q_gpu = reshape(0.5*sigmaE_gpu./mass_gpu,1,1,size(sigmaE_gpu,1)).*Q_gpu;

mer än ett år ago | 0

| accepted

Question

Speed up a for loop by utilizing a gpu

Hello, I'm trying to speed up the following for loop for n=1:size(Q_test,3) Q_test(:,:,n) = sigma(n) / 2 / mass(n) * Q_in(...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to efficiently allocate memory using a parfor loop

Hello all, I have a quick optimization question. I'm doing calculations on some very large point cloud data. The calculation I'...

mer än ett år ago | 1 answer | 1

### 1

answerHow to merge two column cell arrays into one, with alternating values?

I would create a matrix with size a+b then fill it in using steps of two. a=zeros(1,5); b=ones(1,5); c= zeros(1,size(a,2)+siz...

mer än 2 år ago | 0

MEAN AND ROOT MEAN SQUARE

I don't think that matlab likes that you're using curly brackets. Try changing all { } to ( ).

mer än 2 år ago | 0

Question

What's an efficient way to pick a specific slice in a high dimensional array

Hello all, I have an array that can be anywhere from 9 to 16 dimensional. I want to concatinate one of the dimensions into a pre...

mer än 2 år ago | 1 answer | 0

### 1

answerQuestion

Taking the median filter of two images

Hello all, I'm doing an image processing problem where I'm solving a regularized l1 minimization problem for x_n where N is a...

nästan 3 år ago | 1 answer | 0

### 1

answerQuestion

how to change a cell in a string to a string in a table

Hey everyone, I'm trying to use the 'unique' matlab function. unique(table.row) When I try this I get the error "Cell array ...

mer än 4 år ago | 1 answer | 0

### 1

answerQuestion

Setting a Colormap To An Errorbar Plot

Hey guys, I was a just wondering if it's possible set a colormap like 'jet' to an errorbar plot. I found one place that already ...

mer än 4 år ago | 1 answer | 0

### 1

answerA shortcut for recurring if statements

tablerow(1,:) = [a b c d]; for k= 1:numtable2rows tablerow(k+1,:) = tablerow(k,:) + [0 50 0 0]; end This works. Inspired...

mer än 4 år ago | 0

| accepted

How to find a specific word after running the OCR function

In case anyone sees this string I thought of a way around this. Use the code results = ocr(myimage, 'CharacterSet', '"and"'); ...

mer än 4 år ago | 0

| accepted

Question

A shortcut for recurring if statements

Hello, I have a case where I don't know how many elements a vector will have and then depending on different size vectors I'll e...

mer än 4 år ago | 2 answers | 0

### 2

answersQuestion

regexprep help with replacing strings

Hey guys/girls, I'm needing to replace some elements of a string and I'm using regexprep. What I have to replace is a number fo...

mer än 4 år ago | 1 answer | 0

### 1

answerQuestion

how to find an empty row in a table

Hello, I'm trying to get rid of a certain row in a single column table that only has a []. for example if I have a table. ...

mer än 4 år ago | 2 answers | 0

### 2

answersQuestion

How to find repeated values in a column vector

Hello, I'm trying to find every place where a value (1) repeats in a vector and then take only the second time the value repeats...

mer än 4 år ago | 1 answer | 0

### 1

answerQuestion

How to find a specific word after running the OCR function

I'm working on a project where I use the OCR function to analize a picture. I want to find a specific word in the picture, for i...

mer än 4 år ago | 1 answer | 0