Ahmed A. Selman

University of Baghdad

Last seen: Today | Con actividad desde 2013

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Ph.D. in theoretical nuclear physics, author of four books and lecturer at the College of Science-University of Baghdad since 2008. Interested with image processing applications in astronomy mainly. I begun using Matab since the year 2000 (I think it was ver.5.), and still there is much to learn about. Professional Interests: Theoretical Physics

Programming Languages:
MATLAB
Spoken Languages:
Arabic

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Enviada

ENEL
ENEL (EXFOR Nuclear Extraction Library)

alrededor de 1 año hace | 0 descargas |

Enviada

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

casi 2 años hace | 1 descarga |

Enviada

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

más de 9 años hace | 1 descarga |

Enviada

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

más de 9 años hace | 2 descargas |

Respondida
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(...

casi 11 años hace | 4

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

casi 11 años hace | 0

Respondida
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); ...

casi 11 años hace | 0

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Respondida
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'...

casi 11 años hace | 0

Respondida
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; ...

casi 11 años hace | 1

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Respondida
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...

casi 11 años hace | 0

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Respondida
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...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

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

casi 11 años hace | 2

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Respondida
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 ...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

Enviada

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

casi 11 años hace | 1 descarga |

Respondida
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 ...

casi 11 años hace | 0

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

casi 11 años hace | 0

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Respondida
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',[...

casi 11 años hace | 0

Respondida
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; ...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 0

Respondida
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...

casi 11 años hace | 1

Enviada

LVPermute
A simple (Line Vector Permutation) function.

alrededor de 11 años hace | 0 descargas |

Respondida
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...

alrededor de 11 años hace | 0

Respondida
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...

alrededor de 11 años hace | 0

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Respondida
how to code probability in general??
First what is magic(2)? I thought the smallest magic matrix comes (3-by-3) since Magic (2) doesn't satisfy the condition (sum ea...

alrededor de 11 años hace | 0

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Ahmed A. Selman

University of Baghdad

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