Community Profile # Ahmed Abdulla

Last seen: 10 dagar ago Active since 2019

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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...

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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...

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

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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...

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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 ...

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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...

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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...

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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...

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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...

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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 ...

mer än ett år ago | 1 answer | 0

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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

mer än ett år ago | 1 answer | 0

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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...

mer än ett år ago | 1 answer | 0

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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...

mer än ett år ago | 1 answer | 0

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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...

mer än ett år ago | 1 answer | 0

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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 ...

mer än ett år ago | 1 answer | 0

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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...

mer än ett år ago | 1 answer | 0

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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 ...

mer än ett år ago | 1 answer | 0

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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 ...

mer än ett år ago | 1 answer | 0

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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...

mer än ett år ago | 0 answers | 0

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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...

mer än ett år ago | 1 answer | 0

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Obtaining Heteroscedastic regression coefficients and their properties
i managed to figure it out SE = diag(sqrt(E)) where E is the variance-covariance matrix

mer än ett år ago | 0

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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...

mer än ett år ago | 1 answer | 0

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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.

mer än ett år ago | 1 answer | 0

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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...

mer än ett år ago | 0 answers | 0

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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 ...

mer än ett år ago | 1 answer | 0

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A subplot with a numerical value
Ive seen the following figure and i wanted to ask if it was possible to have a subplot with only a value like half of the figure...

mer än ett år ago | 1 answer | 0

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Different coloured markers based on values
I have values to be plotted that range from 0 to 0.1 and i would like the markers of the values less than 0.05 be box markers fi...

mer än ett år ago | 2 answers | 0

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Dealing with NaN values when compressing matrix
I have 1000 by 1000 matrix and i want to convert it into a 10x10 matrix, ive found several way on the community that does this. ...

mer än ett år ago | 1 answer | 0

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Referring to specific input in loop
I am writing a function and the input arguments are Data1 Data2 Data3 Data4 .... DataN. I am running a loop from i=1:N and one o...

mer än ett år ago | 1 answer | 0