Ahmed A. Selman

University of Baghdad

Last seen: ungefär 2 månader ago | Active since 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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Answered
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...

2 månader ago | 0

Submitted

ENEL
ENEL (EXFOR Nuclear Extraction Library)

mer än ett år ago | 0 downloads |

Submitted

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

ungefär 2 år ago | 1 download |

Submitted

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

mer än 9 år ago | 1 download |

Submitted

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

mer än 9 år ago | 2 downloads |

Answered
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(...

ungefär 11 år ago | 4

| accepted

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

ungefär 11 år ago | 0

Answered
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); ...

ungefär 11 år ago | 0

| accepted

Answered
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'...

ungefär 11 år ago | 0

Answered
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; ...

ungefär 11 år ago | 1

| accepted

Answered
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...

ungefär 11 år ago | 0

| accepted

Answered
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...

ungefär 11 år ago | 0

Answered
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...

ungefär 11 år ago | 0

Answered
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...

ungefär 11 år ago | 0

Answered
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...

ungefär 11 år ago | 0

Answered
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...

ungefär 11 år ago | 0

| accepted

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

ungefär 11 år ago | 2

| accepted

Answered
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 ...

mer än 11 år ago | 0

Answered
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...

mer än 11 år ago | 0

Submitted

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

mer än 11 år ago | 1 download |

Answered
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 ...

mer än 11 år ago | 0

| accepted

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

mer än 11 år ago | 0

| accepted

Answered
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',[...

mer än 11 år ago | 0

Answered
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; ...

mer än 11 år ago | 0

Answered
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...

mer än 11 år ago | 0

Answered
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...

mer än 11 år ago | 0

Answered
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...

mer än 11 år ago | 1

Submitted

LVPermute
A simple (Line Vector Permutation) function.

mer än 11 år ago | 0 downloads |

Answered
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...

mer än 11 år ago | 0

Answered
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...

mer än 11 år ago | 0

| accepted

Ahmed A. Selman

University of Baghdad

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