# Konstantinos Sofos

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Senior Quantitative Analyst

MATLAB user since 2005

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I can't plot during my loop! Help!

Hi you could use plot(i,sumX,'k*'); % set black asterisk <</matlabcentral/answers/uploaded_files/46684/mathworks_plot...

8 years ago | 0

Is it possible to stitch two subplot images together, without any gap in between the subplot images?

Hi you can use <http://www.mathworks.com/matlabcentral/fileexchange/27991-tight-subplot subplot_tight> from the FEX. to remove ...

8 years ago | 0

How to 'divide' the x-axis based on y-values?

Hi, There are really many and nice ways to take the desire output...here just one quick solution with some patches x = l...

8 years ago | 1

| accepted

Help regarding usage of Anonymous functions

Hi, Firstly i fully agree with the comment of Star Strider. Because as you say you are "newbie" to matlab i would suggest you...

8 years ago | 0

I have few excel program that I needed to be read by MATLAB. Now I want to enter the file name as an input. How do I make Matlab read that input file name?

Hi, <http://de.mathworks.com/help/matlab/ref/xlsfinfo.html xlsfinfo> will get you a list of sheet names into your Excel file....

8 years ago | 0

| accepted

How to find 'numbers' of unique variable in matrix. How many quantity of variables.

Hi, To reformulate your question (as I understood it) you would like to be able to return the count of occurrences of each el...

8 years ago | 1

| accepted

How to call a function of a matlab file in another matlab file ?

The first function in an m-file (i.e. the main function), is invoked when that m-file is called. It is not required that the mai...

9 years ago | 5

how to find the element which is greater than or equal to its row and smaller or equal to its column in a matrix

Dear Muhammad, You know it's very unfair continuously to ask the forum to solve your exercises/homework. I can understand you...

9 years ago | 2

Is there a method to extract all the data from a nested cell array when each nested cell is of a different size?

Hi George, My first thought would be to apply a recursive function using the <http://de.mathworks.com/help/matlab/ref/cellfun...

9 years ago | 1

| accepted

I have problem with using fopen

Hi Ahmed, Have you read the documentation for the function <http://de.mathworks.com/help/matlab/ref/fopen.html fopen> ? ...

9 years ago | 0

Export data from CSV file as a vector.

As I miss your sample of data, I have created one by myself (attached Data.csv). Below you can find a script that read this type...

9 years ago | 1

| accepted

Standard builtin function for euclidean distance matrix?

what about <http://de.mathworks.com/help/stats/pdist.html pdist>? % Compute the ordinary Euclidean distance. X = [1,...

9 years ago | 1

I want to calculate this integral

Hi Ujjal, In your case you have to numerically evaluate an integral of a 4-variable function. Mathworks provides built-in fun...

9 years ago | 0

How can I use structs as x input for Matlabs optimization methods?

Hi Carolin, Have you seen <http://de.mathworks.com/help/gads/create-a-problem-structure.html Create Problem Structure> ? ...

9 years ago | 0

Using for loop to load multiple mat files of different names

Hi Jonathan, You are quite close. If you want to process all the files whose name matches a pattern in a directory, you can u...

9 years ago | 10

how to find the standard deviation of one file which i want to run it for 100 times.

Hi, Assuming your function is the "PathGen" (because you haven't posted or uploaded anything) with 2 outputs [Path,Time...

9 years ago | 0

Importing multiple datasets from one text file

Hi, I assume that <http://de.mathworks.com/help/matlab/ref/dlmread.html dlmread> will do the job that you need from the time ...

9 years ago | 0

How can I use input values to create an array?

xi = []; % Initialize array/vector for i=1:5 xii = input('Enter value or enter 100 to stop: '); if xii==100 ...

9 years ago | 0

Saving Cell array and String to text file.

Hi, Can you try fid = fopen(FilePath,'w'); fprintf(fid,'%s\n',cellfun(@(x) char(x),Cell_in,'UniformOutput',false)); ...

9 years ago | 1

Binary data processing in an algorithm

Hi Does <http://de.mathworks.com/help/matlab/ref/bitshift.html bitshift> help you? a = intmax('uint8'); s1 = 'Initi...

9 years ago | 1

| accepted

how to find locations of consecutive blocks of ones

Hi Imola, If i understood well you want to build a vector which contains the maximum number of consecutive 1s values of each ...

9 years ago | 1

Assigning values to vectors of different lenghts

Hi, if your starting point is that you have *a* and *c* you can make *d* from *b* as [~,idx] = ismember(c,a); d = ...

9 years ago | 1

| accepted

I did this codes but its not working,can anyone figure out whats wrong?

Hi, *Resize an image using imresize* If you have the Image processing toolbox installed then you could use <http://de.math...

9 years ago | 2

Call file names one by one from an array

Hi, By d.name you call all names,instead use d(idx).name to call the required filename for idx=1:length(d) input...

9 years ago | 0

Unnest a Matrix of strings

Hi, You could use simple the <http://de.mathworks.com/help/matlab/ref/vertcat.html vertcat> vertcat(M{:}) Example: ...

9 years ago | 0

how do I create the below Matrix?

Hi, As James wrote you:Have you reviewed the doc on <http://de.mathworks.com/help/matlab/ref/diag.html diag> to see how to ge...

9 years ago | 0

| accepted

solve residue by matlab

I would suggest to use L'Hôpital's rule but you could use also the following <http://www.mathworks.com/matlabcentral/fileexchang...

9 years ago | 0

Replace String with a NaN in table

Hi, _" I guess they are strings"_ ...you cannot open your table or see in the workspace what type are they? Do you mean so...

9 years ago | 2

Write a function to determine which elements of an array are even numbers (i.e., …, -4, -2, 0, 2, 4, …). Your function should return a logical array of the same size as the input with 1s (TRUE) in the locations corresponding to even numbers.

funvtion Out = findeven(In) Out = ~mod(In,2) end Assuming: In = -6 -5 -2 0 ...

9 years ago | 0

| accepted

Surface under the curve

*griddata* is the key function Does this helps <http://www.mathworks.com/matlabcentral/answers/184254-how-to-plot-a-2d-matrix...

9 years ago | 0