# federico nutarelli

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**Content Feed**

Question

Fast alternative to assign 0 to NaNs

Hi all, is there a astest way to assign to zeros the value NaN? From the Profiler I am noticing that this operation is taking...

6 months ago | 2 answers | 0

### 2

answersQuestion

pre-allocation in loop

Hi all, MATLAB is suggesting me to pre-allocate MATRICI_SIMULATE_nonan and colonna_i in the following loop: A_nan = A~=0; ...

6 months ago | 2 answers | 0

### 2

answersQuestion

Avoiding broadcast variables in parfor

Hi all, the following loop results in an error in C_mat and B_mat: %previously defined N_RIPETIZIONI=2; K=201; parfor n=1:...

6 months ago | 1 answer | 0

### 1

answerQuestion

Correctly indexing a parfor loop

Hi all, I converted a nested for loo into a unique parfor loop. The nested for loop looked like this: for RIPETIZIONE = 1:N_...

6 months ago | 0 answers | 0

### 0

answersQuestion

Speeding up matrix operations

Hi all, say A and B are big matrices and u,s,v are the svd decomposition of another big matrix. Now, is there a way to speed ...

6 months ago | 1 answer | 0

### 1

answerQuestion

Vectorize a nested loop

Hi all, is there a way to vectorize the following loop? for RIPETIZIONE = 1:10 %for k = 1:size(lambda_tol_vector.Valu...

6 months ago | 1 answer | 0

### 1

answerQuestion

Parfor getting slower than a normal for loop

Hi all, I am trying to parallelize the execution of a funtion in matlab. Specifically, I am performing the following code: ...

7 months ago | 0 answers | 0

### 0

answersQuestion

Parfor seems slower than for loop

Hi all, I am trying to parallelize an operation in MATLAB. The MWE goes like this: clear A=rand(5000,3000); B=int8(rand(...

7 months ago | 0 answers | 0

### 0

answersQuestion

Executing macOS command lines on Matlab

Hi all, I am trying to adapt the following code by Weirong Chen to MacOs. function RunRcodemac(RscriptFileName,Rpath) % Thi...

7 months ago | 0 answers | 0

### 0

answersQuestion

Sum selected columns of a matrix

Hi all, I have a matrix that looks as follow: 0.0486947932834768 0.590504451038576 0 0.0579865082127525 0.0490083905415712 0....

9 months ago | 2 answers | 0

### 2

answersQuestion

Reshape a matrix based on indices placed on another matrix

Hi all, I have a matrix called combinations and a vector whose dimension in 119x119. The matrix combinations basically include...

11 months ago | 1 answer | 0

### 1

answerQuestion

Take values greater than 0 excluding NaN

Hi all, I have a matrix A, say, like this: NaN NaN 1 NaN -2 -3 NaN NaN NaN 2 NaN -3 NaN -3 -3 1 -1 2 and would like to ma...

11 months ago | 1 answer | 0

### 1

answerQuestion

Counting the number of appearance of a value in a loop

Hi everyone, I have the following matrix called all_indices_pesi in matlab: consisting of the first column being a column...

11 months ago | 1 answer | 0

### 1

answerQuestion

Spearman correlation fails in ranking strings

Hi all, I would like to compute the correlation between two rankings. Namely, I have two ranked variables, say: table GDP l...

1 year ago | 1 answer | 0

### 1

answerQuestion

Plot a curve on vertical axis

Hi all, I am producin the following image (the red arrows and the red circles are added artificially using a picture software...

1 year ago | 1 answer | 0

### 1

answerQuestion

Set colors for specific entries of heat map

Hi all, I have constructed an heatmap based on a diagonal 50x50 matrix (that I attached to the csv file below). My code looks ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Surface plot using surf() and mesh grid

Hi all, I have two vectors and a matrix that I would like to plot in 3D (as surfaces). I have seen that there is a command call...

2 years ago | 1 answer | 0

### 1

answerQuestion

Inverting curves colors when the distance of their points is 0

Hi all, I have a set of colored curves as follows: let's take, for the sake of simplicity the top two curves in green and p...

2 years ago | 1 answer | 0

### 1

answerQuestion

Saving High Quality graphs within loop

Hii all, I am using a package called borders in matlab to make colored maps. The problem is that the countries have to be col...

2 years ago | 1 answer | 0

### 1

answerQuestion

Smart for loop for summing cell array matrices

Hi all, I have an empty cell test_set_class and a cell matrix class_test made of 100x30 matrices (i.e. each element of classs_...

2 years ago | 2 answers | 0

### 2

answersQuestion

Smartly search between tables

Hi all, so I have two datasets made of 0 and 1. The two datasets (in the form of matlab tables), call them D1 and D2 are 1229x1...

2 years ago | 1 answer | 0

### 1

answerQuestion

Reverting the caxis index

Hi all, I have made the following image (displayed). I would like the caxi to be inverted, i.e. min = 0.4 and max = 0.1. So th...

2 years ago | 1 answer | 0

### 1

answerQuestion

Output argument "K" (and maybe others) not assigned during call to "linear_kernel".

Hi all, the above error apears when I call K = linear_kernel(tX, tX); It does not appear if I do not assign linear_ker...

2 years ago | 1 answer | 0

### 1

answerQuestion

reshaping data properly mesh grid

Hi all, so I have the follwoing problem. I have data stored in a (2000,4) mattrix where the last colum represents the predict...

2 years ago | 1 answer | 0

### 1

answerCheck for missing argument or incorrect argument data type in call to function 'smooth'.

Hi all thank you for answering the question above. I basically forgot to install the curve fitting package. So I get back to the...

2 years ago | 0

Question

Check for missing argument or incorrect argument data type in call to function 'smooth'.

Hi all, the above error emerges also when I try the ssimple toy example in the help of ssmooth function. I am on Mac OSX Cata...

2 years ago | 2 answers | 0

### 2

answersQuestion

Reproducing a smooth curve with random data

Hi guys, I would like to reproduce the above figure with random data. How can I do it? We lost the source code to reprodu...

2 years ago | 0 answers | 0

### 0

answersQuestion

Advanced mean in cell arrays

Hi aall, this is a similar question to one I assked before. But it actualy diffes for a key detail so II opened a new issue. s...

2 years ago | 0 answers | 0

### 0

answersQuestion

How to sum different cells of cell array

Hi all, I have the following problem. I have a cell array (2x100) where each entry is a 11x74 table. What I would llike to d...

2 years ago | 2 answers | 0

### 2

answersQuestion

Parfor nested loop Table definition

Hi all, I am fairly new to matlab. I am trying to parallelize a very heeavy nested for loop. I cannot reproduce it all here s...

2 years ago | 1 answer | 0