# Ahmed Abdulla

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**Content Feed**

Question

Delete files with a specific string

In my directory I have 1000's of files, however some files are not needed and they all have the string "Yes_" in their file name...

10 days ago | 1 answer | 0

### 1

answerQuestion

Divide array into 3 parts

I have a matrix of size (N,3), where I want to divide this matrix into 3 matrices where matrix 1 is 70% of N, matrix 2 is 15% of...

12 days ago | 1 answer | 0

### 1

answerQuestion

Setting Neural network training dataset

I am aware that we can use the lines of code bellow to set the percentages of the dataset to be used for training, testing and v...

12 days ago | 1 answer | 0

### 1

answerQuestion

Colour changes from figure to png upon export

Hi everyone, I am generating a plot using the code below where the lines plotted in the loops are in white and with a width of 0...

22 days ago | 1 answer | 0

### 1

answerQuestion

Change the range of an array

i have a 50x50 matrix with a maximum value of 1000 and a minimum of 200. I am looking for a way to increase the minimum to 350 a...

1 month ago | 3 answers | 0

### 3

answersQuestion

oversampling an array randomly

I have an array that contains 300 observations, and i would like to oversample this array to 472 observation. but i would this t...

5 months ago | 1 answer | 0

### 1

answerQuestion

set training to validation ratio

I have been using fitrensemble (gradient boosting - LSBoost) to find a model that fits my dataset, however I was wondering if an...

5 months ago | 1 answer | 0

### 1

answerQuestion

Machine learning gradient boosting

I am new to the concept of gradient boosting, I would appreciate any links that can lead me to MATLAB implentations/examples/fun...

5 months ago | 1 answer | 0

### 1

answerQuestion

Finding the vertical offset of a gaussian fit

I apologize for posting this question again, as I believe I miss presented my question earlier. I have the following data poi...

6 months ago | 1 answer | 0

### 1

answerQuestion

Obtaining the Gaussian equation for a distribution

I have attached a picture where i have the points in red (array of x and y values) and I would like to fit those points using a ...

6 months ago | 1 answer | 0

### 1

answerQuestion

Command to import column vectors

I am importing .csv files into matlab and usually I just specify the output type to column vectors(as shown in the picture), I w...

7 months ago | 1 answer | 0

### 1

answerQuestion

Evaluate integral at specific value

I have the following mathematical function f=5sin(x), I use the int(f) to obtain the integral of my expression. Is there a way f...

8 months ago | 1 answer | 0

### 1

answerQuestion

non continuous double integration

I am looking to integrate the following function 5sin(x) dx dy, however I am only aware of performing integrals for specific upp...

8 months ago | 1 answer | 0

### 1

answerQuestion

Accessing .cdf files

I have downloaded some space science data from the following link,however, the file format is .cdf and I have no experience with...

8 months ago | 1 answer | 0

### 1

answerQuestion

Out of memory problem

Im running a code that deals with large datasets and i've made it as efficient as i possibly can by deleting any variables that ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Obtaining the standard normal z score

Is there an easy way to obtain the standard normal z score with an upper tail probability of 0.05/2 or any number at hand

1 year ago | 1 answer | 0

### 1

answerQuestion

Acquiring blocks of data

I have a 100x100 matrix (Matrix A) and ive been trying to get a matrix B. Where each cell in matrix B contains an array of all t...

1 year ago | 1 answer | 0

### 1

answerQuestion

Returning values from Blockproc

I used the following code to calculate the mean of blocks of data(compress down my matrix), but i was wondering if there is a wa...

1 year ago | 1 answer | 0

### 1

answerQuestion

Setting color to text from a colormap

I have generated the following figure, the numbers are the correlatios from the scatter plot, i was thinking of changing the col...

1 year ago | 1 answer | 0

### 1

answerQuestion

Suggestions on how to generate a mask

I have a matrix that is 1440x2880 of remote sensed temperatures from satallites, i was wondering if there is any way that i can ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Grabbing points from scatter plot

I have 2 matrices and i plotted them on a scatter plot and i would like to highlight some points from the plot and discard all t...

1 year ago | 1 answer | 0

### 1

answerQuestion

Evaluating the probability as a one tailed students t distribution

I have a value “tj” and I would like to evaluate the probability of this value using the students t distribution. I also have ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Calling a string from string array

I have an array 1 by 11 which has 11 strings but i wanted to know how can i name the title of one of my plots as the 3rd string ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Obtaining the t-P value of the partial correlations

sorry if this sounds stupid, the following picture is from a paper i am reading, i have obtained a matrix of r (the partial corr...

1 year ago | 0 answers | 0

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answersQuestion

Obtaining the P values for the t stat

I have both the tstat and the degrees of freedom, is there a quick way to find the P value of a two tailed hypothesis at a signi...

1 year ago | 1 answer | 0

### 1

answerObtaining Heteroscedastic regression coefficients and their properties

i managed to figure it out SE = diag(sqrt(E)) where E is the variance-covariance matrix

1 year ago | 0

| accepted

Question

Obtaining Heteroscedastic regression coefficients and their properties

the picture attaches shows the normal regression line results using the fitlm :estimates of the regression coefficients, the Sta...

1 year ago | 1 answer | 0

### 1

answerQuestion

Is it possible to access the lines of code from a pre built command

I wanted to ask if it was possible to see what lines of code run when a pre built function or command gets run in matlab.

1 year ago | 1 answer | 0

### 1

answerQuestion

Converting .tif file into an .ascii file

I have a .tif file that i would like to convert to .ascii . Or a way to be able to convert the .tif file into a numerical matrix...

1 year ago | 0 answers | 0

### 0

answersQuestion

a figure with only a numeric value

I want to find the correlation between two data sets and just have a figure without any points or anything it just displays the ...

1 year ago | 1 answer | 0