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# David K.

56 total contributions since 2019

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Changing a for loop to recursion
Recursion happens when a function calls itself, which is something you are not doing. The first step when creating a recursive...

4 months ago | 1

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matlab loops/if statements help for a beginner
So problem 1 is that size is outputting a vector and not a single value. It outputs both dimensions so for your example m is [1 ...

4 months ago | 0

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Trying to play Sound at random times during elapsed time.
So as you noticed, etime == randomTime will not work because etime needs input arguments. So fix that issue with this: etime(cl...

4 months ago | 1

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Splitting a table into smaller ones based on two columns
I would do it as such: n = 1; a = your table% I used table([1;2;3;4;5;],[1;5;1;3;1]) to sort of test while ~isempty(a) % whi...

4 months ago | 1

How can I make a step response graph for open Loop Ziegler-Nichols Method?
When trying to do transfer functions in matlab one very nice way to do it is with s = tf('s'); Now, s indicates it is a trans...

4 months ago | 1

You cannot start at P(0) because matlab does not let you index at 0. However, you can make it so that it works as expected. Ever...

4 months ago | 2

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Convert row or coloumn matrix into rowXcoloumn matrix
I would do it as such: P = 1:10; out = reshape(P,[2,5]); out = out'; % Take transpose

4 months ago | 0

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Two dimensional interpolation polynomial
First off, I looked a little bit on wikis to find https://en.wikipedia.org/wiki/Multivariate_interpolation which might have what...

4 months ago | 1

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Plotting loop value according to years
The problem is that the value b is not being saved within the loop, so your plot function is trying to plot a single value which...

4 months ago | 0

How to calculate averaged values from 5-min interval values
Using for loops is a very straightforward way that this can be done: x = yourData; %your data size1 = length(x)/12; size2 = 2...

4 months ago | 0

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Separating a colymn into two columns (.txt file)
I would do it like this: %t = your table; dataCell = table2cell(t); % convert to cells dataCell = dataCell(11:end); % remove ...

4 months ago | 0

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Unable to perform assignment because the left and right sides have a different number of elements.
The first problem is that Tr is a vector being assigned to a single value of r1, this is fixed as such: r1(n+1)=r1(n)+h*(K01*(C...

4 months ago | 0

I need help with some graphs
Since you need to plot in 3 dimensions I will be using the surf function. What I would first do is solve all of these equation...

4 months ago | 1

Simulink - How to create a conditional "if" block with more than 3 conditions?
**Moved from questions to answer** When you know the matlab code needed to do something in Simulink a Matlab Fuction Block can ...

4 months ago | 0

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How to skip a file in reading a series of csv files using csvread?
One method, though it may be one that is often advised against, is to use a try catch block around the code. When an error occur...

4 months ago | 0

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How to change the style or fount of a static text on GUIDE
Inside the guide interface you can double click the static text to bring up its properties. Then, you can change the listed font...

4 months ago | 0

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Updating a value inside for loop
A common way people do things like this is with an if statement. For the condition of the if statement you need to relate it to ...

5 months ago | 1

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hi how to solve below eqation in matlab command window in tf command
The tf function expects the num and den to be matrices that hold the coefficients to the numerator and denominator. In your case...

5 months ago | 0

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plotting data from data files and saving each plot through out each run of the loop
If you wish to have all the plots on the same figure, you need to use figure; hold on %The rest of your code If you wish to...

5 months ago | 0

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Element replacement of matrix.
If using a for loop is not actually a requirement you can do this very simply as such: myMatrix = rand(5,4); % create 5x4 matri...

5 months ago | 0

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How to edit plots?
Using your sample code, I do not see what the error is. However I made a few changes to the code that I believe make the output ...

5 months ago | 0

How to randomize audio files
It looks to me that the line aud_file=strcat('C:\toolbox\aud_file\',audio_files(i).name); is where you get a song. Since the ...

5 months ago | 1

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Trajectory animation using coordinate points
I would do it like this: % x1,x2,y1,y2,z1,z2 are your coordinate vectors tstep = .1; % the amount of time between each value i...

5 months ago | 1

How would you plot a graph which a ball then rolls down (say a y=x^2 graph)
I attached a .m file I created that should work pretty well. It uses a numerical solution by calculating the slope at discrete t...

5 months ago | 1

Sorting a table in Matlab
Yes, you can do it with the sortrows function. Here is an example: A = [1 2 4 5 3 6 5 6]; B = {'a', 'b', 'c', 'e', 'f', 'ba', ...

5 months ago | 0

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So i wanted to add a column to this table.
So one big problem here is that you do not have a table. You have a matrix. And matrices cannot have strings and numbers in them...

5 months ago | 1

hey guys im trying to plot this in 3D but i keep getting an error, "Data cannot have more than 2 dimensions."
So the issue is that plot3 takes either a vector or a 2d matrix. Since you are plotting it as points you do not actually need to...

6 months ago | 2

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Index exceeds matrix dimensions
It appears that for some reason fileNameArray is not being populated with values in the line fileNameArray = dir('*.dat'); Ma...

6 months ago | 0

How to find specific values in a table, and create an array from rows containing those values?
Here is my go at it. % Create my table so you know what I am testing with. names = {'ssrp' , 'ssrp','tghh'}'; values = [123, ...

6 months ago | 0

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