Ahmed A. Selman

University of Baghdad

Last seen: 9 mois il y a | Actif depuis 2013

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Ph.D. in theoretical nuclear physics, author of four books and assistant professor at the College of Science-University of Baghdad since 2008. IAU Member since 2021. Recently working on nuclear astrophysics of stars. Interested with image processing applications in astronomy. I begun using Matab since the year 2000 (I think it was ver.5.0), and still there is much to learn about. Google Scholar: https://scholar.google.com/citations?user=TwoAY4wAAAAJ IAU: https://www.iau.org/administration/membership/individual/20684/

Programming Languages:
MATLAB
Spoken Languages:
English, Arabic
Pronouns:
He/him
Professional Interests:
Mathematics, Physics, Gravitation, Cosmology & Astrophysics, Particle & Nuclear Physics

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Optimize loop to reduce run time
Inside the loops of ii and jj, try to move the lines that do not depend on ii out of that loop. It might help to improve some r...

9 mois il y a | 0

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ENEL
ENEL (EXFOR Nuclear Extraction Library)

presque 2 ans il y a | 1 téléchargement |

A soumis

ENEL (EXFOR Nuclear Extraction Library)
The code reads nuclear cross section (vs energy) found in C4 datafile in ENDF format.

presque 3 ans il y a | 1 téléchargement |

A soumis

dec2any(x,n)
Decimal (base 10) number to any (base 2 to 10) converion function.

environ 10 ans il y a | 1 téléchargement |

A soumis

dec2senary(num)
Decimal (base 10) number to senary (base 6) converion function.

environ 10 ans il y a | 1 téléchargement |

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Help naming text file according to user input
Just add the extension you like to the variable (fileName), as prompt = 'Please enter the file name: '; fileName = input(...

plus de 11 ans il y a | 4

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how to find the second order partial derivative of an image?
See older and similar question here: <http://www.mathworks.com/matlabcentral/answers/67893>

plus de 11 ans il y a | 0

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Reshape array for 256 by 256 matrix showing 16 by 256
Dear sudipta, I have downloaded your data file, and went like a=load('1372387722318.txt'); y=reshape (a,256,256); ...

plus de 11 ans il y a | 0

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Save 512x512 matrix to text file
This code works perfectly. To check it add the following at the very end of the above code: fid = fopen('Mymatrix.txt','r'...

presque 12 ans il y a | 0

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solve 2 equation of 2 unknown
Use the code instead: clc clear syms theta3 r1 %sind(theta3) % NOT NEEDED r2=3; r3=3.927; r4=0.335; ...

presque 12 ans il y a | 1

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extracting submatrices from cell
Try the same example with: X={1, 'a'; 'b', 3.14}; K1=X(2,:) [K21 K22]=X{2,:} Then use whos to...

presque 12 ans il y a | 0

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How to identify boundaries of shapes in an image using the change in color
There are few files in the file-exchange <http://www.mathworks.com/matlabcentral/fileexchange/> so do some search there, you mig...

presque 12 ans il y a | 0

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error message using polynom
A polynomial P(x) is said to be (badly conditioned) when a small variances of x leads to large errors of P, causing unstable err...

presque 12 ans il y a | 0

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Creating a matrix with matrices on the sub and super diagonals
Use the command (diag) for creating a (main) diagonal matrix from a vector A, and the command (spdiags) to create sub- and super...

presque 12 ans il y a | 0

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Picking out a value from a Vector in a Loop iteration
Within your same code: ... plot(Y(:,1),Y(:,2),'o'); z=zeros(1,length(X)); % Add this for i = 1:length(X) f...

presque 12 ans il y a | 0

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More help with probability...
Just pay attention to how you use function call inside a program. Either you have two files as stated above, or use one main (ca...

presque 12 ans il y a | 0

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How to plot with a logarithmic scale?
semilogx(x,y)

presque 12 ans il y a | 2

| A accepté

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how to solve loops conditions ??
#1) Using for loops only: clear k=0; for i=1:6 for j=1:5 k=k+1; A(i,j)=k; end end ...

presque 12 ans il y a | 0

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Symbolic expressions: abs(x^(1/3)) =?= abs(x)^(1/3)
Some times we get confused between mathematics and programming, it is an often thing. Yet, mathematics means logic, programs try...

presque 12 ans il y a | 0

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Blancmange-Takagi Function
Used to plot the Blancmange-Takagi function of order (w) and range (x).

presque 12 ans il y a | 3 téléchargements |

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how to write a .dat file in matlab?
The obvious method is to construct a loop to read filenames, inside it, open and read, then accumulate the data content in some ...

presque 12 ans il y a | 0

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Reading many files in one loop
Download a function file called folderFiles.m. <http://www.mathworks.com/matlabcentral/fileexchange/40877-folderfiles-m> ...

presque 12 ans il y a | 0

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How to read a text file line by line?
Try selecting one dimension a time for each line, e.g., ... time=fscanf(fID,'%g',[1 1:2:inf]); acce=fscanf(fID,'%g',[...

presque 12 ans il y a | 0

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Obtaning a matrix with the right indexes
Try this out to see if it solves the issue: clear clc N=20; %for example H=sym(zeros(N,4)); B=1:N; ...

presque 12 ans il y a | 0

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How to create a nested for loop to create a mesh plot
I'm not sure what are your conditions (in the if statements), but you used (y1) as a matrix index which cannot be made unless (y...

presque 12 ans il y a | 0

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Hi all, could you please help me to solve this equation either numerically of symbolically.
If all variables other than (y) are known, then let's write some notes here: 1) Try to first define the variables, namely: kw...

presque 12 ans il y a | 0

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Issue with writing multiple variable to excel sheet
It is not practical to write a single line in an excel file, for a large amount of data or inside a long-time running loop. If y...

presque 12 ans il y a | 1

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LVPermute
A simple (Line Vector Permutation) function.

presque 12 ans il y a | 1 téléchargement |

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while loop question number 2
In such a case, using a while loop cannot do the job, but an if statement can. So, I think this is what are you looking for (con...

presque 12 ans il y a | 0

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How to plot a complicated function
It is the same code you wrote, only add loops over c and tau, and use the function (ezplot) to plot a function handle. And DO NO...

presque 12 ans il y a | 0

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Ahmed A. Selman

University of Baghdad

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