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David K.


47 total contributions since 2019

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Answered
How to calculate averaged values from 5-min interval values
Using for loops is a very straightforward way that this can be done: x = temps(8928,1); %your data sub1 = ones(8928/12,1); % i...

ungefär 2 timmar ago | 0

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Answered
imbinarize vs im2bw
I believe the reason you are not getting the same is because of the threshold that is chosen for the conversion. im2bw(image) d...

en dag 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...

2 dagar ago | 0

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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...

2 dagar ago | 1

Answered
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 ...

2 dagar 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...

3 dagar ago | 0

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Answered
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 dagar ago | 0

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Answered
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 ...

7 dagar ago | 1

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Answered
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...

8 dagar ago | 0

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Answered
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...

8 dagar ago | 0

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Answered
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...

9 dagar ago | 0

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Answered
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 ...

9 dagar ago | 0

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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 ...

10 dagar ago | 0

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Answered
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...

17 dagar ago | 0

Answered
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...

24 dagar ago | 1

Answered
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', ...

28 dagar ago | 0

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Answered
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...

ungefär en månad ago | 1

Answered
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...

ungefär en månad ago | 2

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

ungefär en månad ago | 0

Answered
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, ...

ungefär en månad ago | 0

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Answered
Index exceeds array bounds error
The problem is a0. In the line hzrd(i,j)=exp(a(i)+b*w(i,j)) ; a needs to be have at least k elements for it to work. You set ...

ungefär 2 månader ago | 1

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Answered
how to store multpile files which has been loaded first in the same script ,in the new variable , through loop
So, I believe this answer could be done using the eval function but since that function is highly discouraged here is my attempt...

ungefär 2 månader ago | 0

Answered
Why are spaces ignored when a character string is scanned?
This is because of the way fscanf reads it in. If you go to the linked documentation and scroll down to Character Fields, it not...

ungefär 2 månader ago | 0

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How many years to double initial investment with various interest rates
If I understand the equation you posted correctly lets walk through this. S = total amount after n years if P was initially inve...

ungefär 2 månader ago | 0

Answered
Generating a grid around circles in an image
So I felt like making it interactive so I used the built in guide function in matlab to create a GUI. Attached are the two files...

ungefär 2 månader ago | 1

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Answered
What sort of a filter/method can be applied to smoothen sharp peaks on a surface?
In general, if you want to smooth out peaks you want to get rid of the high frequency content, aka a low pass filter. The easies...

ungefär 2 månader ago | 0

Answered
How to plot for different values of parameters on one run?
Matlab actually has a page on this called Parameterizing Functions. Using one of the options for that I believe this will do i...

ungefär 2 månader ago | 0

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Answered
How to create an animated plot of a temperature data with holding on each year?
Alright lets see how much I can help with. First off to gradient between colors I have a little way down below. I get the rgb ...

ungefär 2 månader ago | 1

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Answered
can someone please help me to find out mistake
Here you go. A few things needed to be changed. First the change that Torsten initially pointed out. Then we further change it t...

ungefär 2 månader ago | 0

Answered
storing output of for loop
I believe your goal can be more easily solved using the built in Matlab function reshape. It looks to me like you have a 1x30000...

ungefär 2 månader ago | 0

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