# Max Heimann

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**Content Feed**

Question

How to escape a portion of a string in regular expressions

Hello, i want to dynamically create a regular expression from an input string. However i only want a small subset of expression...

2 months ago | 1 answer | 0

### 1

answerI can't manage to stack plot 2 columns with the right graph size

You can alter the axis range with 'xlim' figure('name','examplefigure') % plot data subplot(2,2,1) plot(1:10,rand(1,10)) % ...

3 months ago | 0

| accepted

I can't use the '.' in matlab simulink block.

What do you want to do? Simply writing '.' as the gain value wont work. If you are struggling with actually entering the symbol...

3 months ago | 0

Doesn't addpath support adding multiple folder paths at the same time?

According to the addpath documentation (mathworks.com/help/matlab/ref/addpath.html), you can add multiple paths at the same time...

3 months ago | 0

| accepted

Is it possible to change dynamically the PATH?

You can use the "mfilename" command to get the path of the currently running script and define a relative path from there. [fna...

4 months ago | 0

| accepted

Question

Determine the (pixel) width of a string

Hi, I want to scale some ui elements according to the width of a string. E.g. the string 'abcdef' has 6 letters, but is obvious...

4 months ago | 1 answer | 0

### 1

answerPreallocation: speeding up loop with variable dimensions

Are you sure your code is slow due to non-preallocated elements? If you want to improve the performance i would suggest you use ...

4 months ago | 0

| accepted

I want to move an object along Y axis up and down. how can I do this? Thanks in advance.

Do you just want to offset the data once or do you want to move it after you already plotted it? For offsetting just once, just...

4 months ago | 0

How to round the number to the integer? ( having other's code)

int16() is a cast into an integer datatype. Those datatypes only support whole numbers and thus the data is rounded via some int...

4 months ago | 0

Multivariable Function from User Input; Pass Function to be Calculated

Its an interesting problem. Generally if you just want to solve some circuit problems with matlab,i would just use a script wher...

4 months ago | 0

| accepted

How can I export scripted iteration results to base-workspace programmatically in 2017b ?

The error message says you have a variable called "Iteration 1", which is not allowed. Probably no blank spaces are allowed in ...

4 months ago | 1

| accepted

I have a loop containing about 6 operations, there is a logic statement that applies to 5/6 of the functions.

Something like this? function [status, result] = func(op,a1,a2) status = 0; result = 0; [row1,col1] = size(a1) if row1 ...

4 months ago | 0

Finding the determinant without det(a)

According to the error you are trying to access an index which is not part of the variable. Are you sure a1 is a 3x3 matrix? I...

4 months ago | 0

| accepted

Accessing code for built-in functions

These functions are not accessible to users as they are MATLABs proprietary code. They are p-coded, which its matlabs way to obs...

4 months ago | 2

How to extract certain indexes from a vector, but keeping the length the same by filling the rest u with NaNs

You can try something like this: angleVector = rand(1,10); indexVector = [3 4 5 6]; nanVector = NaN(1,length(angleVector)); ...

4 months ago | 0

| accepted

Sum of different column elements of a matrix

Matlab supports linear indexing of matrices. Which means you can define a vector with all the matrix elements you want to add li...

4 months ago | 0

How can I obtain the controller output via the command line?

You could use "step" to simulate a step response. Or lsim to simulate other inputs.

4 months ago | 0

How to use a variavle calculate by a code to another code?

Im not sure i get your point about long code and reused variables. Its also a bit unclear what kind of code we are talking about...

4 months ago | 0

extrapolate data to cross x axis

In order for this question to be answered you should define what you mean by "nice". Unfortunately your code sample is not runab...

4 months ago | 0

corners of rectangle by center point

Do you want the corners of the 2D projection of a rotated plane? In that case you could simply calculate the 3D position of each...

4 months ago | 0

Using parallel computing for problem-based optimization

If the program runs fine without parallel computing and errors out with parallel computing the error might be a dynamic array si...

4 months ago | 0

| accepted

Take images from webcam in every second

How are you keeping track of the 1 second intervals? Maybe the process of taking the image and storing it takes longer than .5 ...

4 months ago | 0

How do i resolve this error

Try turning the multiplication in the middle into an elementwise multiplication aswell. Also, the last multiplication probably...

4 months ago | 0

Can I get a solution in Simulink

The error message seems clear. You must define a discrete solver for your simulation. Go to modelling -> model settings -> solv...

4 months ago | 0

look for data in cell array and avoid certain data during that search

You could try regexp. It accepts cells of strings and returns the indices of the matches for each cell entry. If you want to e...

4 months ago | 0

How to create a countdown timer ?

If you just want a 30 second delay in you code, you can use this: pause(30) If you want some form of visible timer you could u...

4 months ago | 0

I'm looking to generate a bode plot of the following function in matlab: Gc(s)G(s) = K*e^-Ts / s when T = 0.2

You could try: s = tf('s') T = 0.2; K = <some value> GcG = K * e ^ (-T * s) bode(GcG)

4 months ago | 0

How do i plot N amount of rows into a point plot?

Whats the content of your variable "grades"? You can plot multiple lines one after the other with the hold command. (A,B,C,D,E,...

4 months ago | 0

| accepted

how can i use my function directly on a array without having x and y?

The function you defined has 3 arguments. x,y and a. function img(x,y,a) imagesc(x,y,a); set(gca,'YDir','normal'); ...

4 months ago | 0

Running my script multiple times and storing variables in a matrix

I am not sure i understand what you are trying to achieve. What percentage are we talking about? It sounds like you want to call...

4 months ago | 0

| accepted