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Content Feed
MATLAB Answers Wish-list #5 (and bug reports)
Background: I recently put some effort into answering How to store and reuse coefficients in a for loop. My answer together wi...
22 hours ago | 1
How to store and reuse coefficients in a for loop
Caveat: I don't fully understand your code and what I say might not be relevant to your real project. "% Can this double for lo...
2 days ago | 1
check ismember for each element individually
The function arrayfun() does the trick (i.e. hides the foor-loop) a=[ 1 2 3 3 5 6 6]; b=[1 2 3 5 6]; cac = arrayfun( @(ii) fi...
2 days ago | 0
Is it possible to put multiple functions in one matlab file file?
"I currently have six seperate scripts [you mean functions?]" What differs between the six functions? The name of the nc-files ...
25 days ago | 0
When constructing an instance of class, the constructor must preserve the class of the returned object.
I don't know C++. (For some reason you added the tag "C++".) I guess you are biased by some other language. You need to look cl...
1 month ago | 0
How do I make this a function?
Something like this. With Matlab it's common practise to use double for all numerical variables. (Matlab has "integer in floatin...
2 months ago | 0
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Create table from structure - alignment
I've modified the format specifier. %% mom.a = 1; mom.b = 2; mom.veryLongName = 3; header = {'Moment'; 'Value'}; fnames = ...
2 months ago | 0
How to replace a number in a row vector with NaN in certain condition
abs(x(6)-x(8)) is equal to 10. Accourding to x_new, x(8) should be replaced by NaN. Thus I have use ">=". %% vec = [15 13 9 ...
2 months ago | 1
| accepted
Getting Windows to open a file type using a MATLAB application
An alternative that doesn't require the Matlab compiler (but requires a Matlab license to run): Create a bat-file, e.g. read_xl...
2 months ago | 0
How can I read a '.dat' file on MATLAB?
google says: "A file with the . dat file extension is a generic data file that stores specific information relating to the progr...
2 months ago | 0
How to quickly find the indecies of elements in an array?
A = [1 9 2 8 3 7 4 6 5]; B = [5 6 7]; [~,ix] = ismember( B, A )
2 months ago | 0
| accepted
creating a character array in which each element takes multiple characters put together
The RHS of the two assignments in the for-loop are they correct? Don't show data as images. Seven lines can be included as cod...
2 months ago | 0
Why is command window printing out all the code?
There is a function called echo(), which I've never used. Have you run echo on by mistake? I reproduced the behavior you see ...
2 months ago | 0
Extracting data using regular expression
"all the columns [...] named "Physics", "Time", "dt", "Progress", "Nonlinear Iteration" "Linear Iterations"...."Nodes After Adap...
2 months ago | 1
| accepted
Load .dat files from subfolders with different names
Yes to both questions. With help of the code snippets below I guess you can put together a script. sad = dir( fullfile('Folder...
2 months ago | 0
Index exceeds the number of array elements (1).
Here are some links on debugging in Matlab Debug a MATLAB Program Debugging in MATLAB Debugging session Debugging Approaches...
2 months ago | 0
Specific values in an Array
R=[]; for i=1:1:5 for y=5:1:10 eq1=i*y; %% To save the values: R=[R; i y eq1]; end end a...
2 months ago | 1
Auto fetch input files to process from a specified folder
"I have a lot of data files that I would like to process through my code [...] each file from a specified folder one at a time" ...
2 months ago | 0
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Plotting a limited number of elements
"plot the first 5" An if-statement should do that. Replace plot(jvals(i,:), vetor_momentoj(i,:), '-o'), hold all by if i <= ...
2 months ago | 1
| accepted
How to modify a function handle?
That's simpler than you thought %% f1 = @(y) y; f2 = @(y) f1(y)*2; %% f2(5)
2 months ago | 0
| accepted
Storing variables in a for loop within another
"store the variable "vetor_momentoj" [...] in terms of the indexes i and j." Something like this? I replaced the calculation of...
2 months ago | 0
| accepted
Calculate with initial value
There is nothing that terminates the execution of the loop when convergence is reached. Thus, the while-loop will run until the ...
2 months ago | 1
| accepted
How to save data from a file with text and numbers?
"load this file and save lines starting from 'Step' to 'ID Type' to another file" Including the "ID Type" block - or not ? Thi...
2 months ago | 0
| accepted
what's wrong with this "IF" in the code below?
Cannot tell based on the info of your question. Show full error message. Set Pause on Errors Run the code. Execution will h...
2 months ago | 1
how to delete data with special value in an array?
"to delete the value" Do you mean remove? If so, try this script which uses logical indexing %% vec = 1+2*randn( 1, 800 ); %...
2 months ago | 0
| accepted
conversion of date from yyyymmddHHMMSS format to yymmddHHMMSS format.
vec = datevec( '2020,07,23,00,00,00', 'yyyy,mm,dd,HH,MM,SS' ); datestr( vec, 'yymmddHHMMSS' ) or did you mean datestr( vec, '...
2 months ago | 0
I am getting "Too few input arguments." error. How can i solve it?
See Not enough input arguments. And see narginchk - Validate number of input arguments.
2 months ago | 0
Trying to see if a variable is an integer or not
Try this %% x=2.5; answer = ( x == floor(x) )
3 months ago | 0
| accepted
Not enough input arguments.
You need to call the function, Lorenz, with two input arguments: t and x. E.g. %% x = (1:6); t = nan; xprime = Lorenz( t, x...
3 months ago | 0
| accepted
Help indexing: How to index at the interfaces of cells and not the cells
Index in position 2 exceeds array bounds U(:,j+2) is most likely the problem. I assume that the size of U is NEQxN. The max...
3 months ago | 1
| accepted
