# Rik

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E-mails with feedback/questions about FEX submissions are welcomed. In general I will post e-mails about Answers on the related page, unless there is good cause not to do so.

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**Feeds**

cannot find downloaded files!

These download+install programs tend to download file in two locations: your downloads folder and your temp folder. I don't know...

6 dagar ago | 0

Concatenating a cell array

The assignment tells you to use a for loop. So even if it can be solved without one, let's do it. But before we can do that, we ...

6 dagar ago | 0

| accepted

Evaluating function handles without writting inputs

The only way I can think of would be by wrapping the anonymous functions. x=5;y=10; f=@(x,y) x.^2+y.^2; f=@() f(x,y); phi ...

12 dagar ago | 0

Fastest way of opening a text file and converting it to a matrix?

doc fscanf If you know the format, using that knowledge always improves speed, since the more complicated tools don't need t...

23 dagar ago | 0

Delete part of a 4D array

Let's try something: try data=rand(4,3,5,6); data(1:2,3,:,:)=[]; catch ME warning('error: %s',ME.message) end ...

24 dagar ago | 0

use struct in loop for

I fully agree with Dyuman and Stephen. As to the source of the error in this code: the error message is giving you a hint. So...

25 dagar ago | 0

how to do for loop 2nd level?

Your code can be optimized, but here are the minimal changes. beam = {'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'...

ungefär en månad ago | 0

| accepted

Store values from loop

If you want to store results from all iterations, you need to store them and not overwrite them: res1 = cell(1,100);index = 0; ...

ungefär en månad ago | 0

| accepted

M-scripting tutorial

If you want to learn the Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks). If...

ungefär en månad ago | 0

Using string variable names for dot indexing

You're missing parentheses: varnames = {'rsrp_nr' 'sinr_nr'}; T=table(pi,2*pi,VariableName={'rsrp_nr' 'sinr_nr'}) T.(varnames...

ungefär 2 månader ago | 1

define function in one line

I don't know if you want to avoid anonymous functions as well, but this should give you a finer plot: % p = sin(t) when t<0.6 ...

ungefär 2 månader ago | 0

| accepted

Clear distinction between positive and negative in colorbar

I would suggest using the top half of viridis and the bottom half of plasma (or the reverse). You can get both of them here. Th...

2 månader ago | 1

how can I extract values from a struct matrix that contains only one value to make single matrix from it?

Using numbered field names is a bad idea. It is almost as bad as using numbered variable names directly. The solution is to use...

3 månader ago | 0

What to do if my script gives error "The input was too complicated or too big for MATLAB to parse"?

I know I'm almost 7 years late to the party, but I just ran into this problem and was able to find a source and solution. For m...

3 månader ago | 1

I have a matrix problem to solve; A = (:,1) and B = (:,1) and C(:,1) matrixes. This I need in the tensor form like shown in the figure. How to calculate the determinant.

Use the zeros and size functions to generate the zeros row by row. Once you have the matrix you can use the det function to calc...

3 månader ago | 0

Coding practices to simplify complex functions

I would suggest using a struct (or Name,Value pairs) for functions with more than 4 inputs. The attached function allows parsing...

3 månader ago | 0

I have algorithm I have estimated the data pretty well , but I 'm not able to forecast it .

As the error message is telling you, the problem is here; error('Forecast:TooFewSamples','The data should contain at least %d ...

3 månader ago | 0

AppDesigner in headless mode (without GUI)

I'm not aware of a way to use an AppDesigner app without the app, so I doubt you will like my suggestion: You should extract th...

3 månader ago | 2

install add-on

Windows is picky with spaces in the path, so you need to add double quotes. The command below might do the trick. cd "C:\Pr...

4 månader ago | 0

Help, my matlab mex file format is weird

When I download it, it isn't a plain text file. Often when people attempt to download a file from github, they save the web v...

4 månader ago | 0

How to plot 4d bar with 4 column vectors?

For this small number of elements, I would try plot3, with the 4th dimension replaced by color. Once you get to many more dat...

4 månader ago | 0

Why MATLAB R2023b requires macOS 12.6? Would 12.3 work?

Each Matlab release has a range of OS versions that are officially supported. This is only the official list. It is very well po...

4 månader ago | 0

Transforming workspace into table using script in MATLAB

Since it is a variable in the main workspace, it is already available in scripts. However, you should not use scripts for serio...

4 månader ago | 0

| accepted

How to increase speed of a multi-vector calculation

The iterations are not interdependent, so you should be able to use a parfor loop instead. You could consider performing thos...

4 månader ago | 0

Setting the editor (not Live editor) text and background colors from code

I always run MATLAB Schemer after I install Matlab. You can dig into the code to find the actual field you can use. It might no...

4 månader ago | 1

My datastructure only contains the last subjects information. So in my for loop the structure is getting overwritten. How can I change this?

Your last line overwrite the struct every iteration. Using indexing will create an array: Datastructure(i) = Input_Data( .....

5 månader ago | 0

Insert array into larger array with unknown number of dimensions

It will probably hurt performance, but you could calculate the linear indices with sub2ind. Alternatively, you can use this tri...

6 månader ago | 1

| accepted

precision of string conversion using string()

Let's first replicate what you show: my_fun([],@string) my_fun([pi]) my_fun([pi 1]) my_fun([pi 100]) my_fun([pi 127]) my_f...

6 månader ago | 1

| accepted

Change colors (of groups) in scatter plot

As the documentation explains, you can set the colormap: a = [37 98 1; 35 94 1; 33 97 1; ...

6 månader ago | 1

| accepted

Error using matlab.internal.math.interp1, Sample points must be unique.

interp1 is not intended to fit equations. There are other tools to do that. If you insist on using this function, you will eithe...

6 månader ago | 0