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David Harra


Last seen: 3 días ago Active since 2021

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How to tell if random points are in the same feature or not
I have a vornoi diagram populated with random points of 2 arrays. From each of the points I can calculate the distance between...

19 días ago | 1 answer | 0

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answer

Question


Create line of pixels on an image
I am trying to achieve the Two Point Correlation function for a distribution of grain sizes. As a practice example, I have gen...

23 días ago | 1 answer | 0

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answer

Question


Can not envelope my data
I was looking to envelope my data so I can get the peaks and do some FFT on the data but when I go to envelope my signal I get a...

alrededor de 1 mes ago | 1 answer | 0

1

answer

Question


Using Data to reconstruct an image
I have 2 images of grains, one that contains smaller and one that contains significanlty larger. Each material is achieved via a...

alrededor de 2 meses ago | 1 answer | 0

1

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Question


How to plot 3D plot from polar plot
I am looking at plotting the the slowness profiles of Titinium (Inverser of velocity) by solving the christoffell equation. I h...

alrededor de 2 meses ago | 1 answer | 1

1

answer

Question


How to get centre frequency of a pulse
I have an A-scan coollected from a simulation. I am trying to obtaon the the centre frequency from the initial pulse and I am un...

3 meses ago | 1 answer | 1

1

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Question


Create Header with write matrix function
I have exported some data into a CSV file in from Matlab (144 x 4 matrix) At the top of each column I would like to add a titl...

4 meses ago | 1 answer | 0

1

answer

Question


Grain Model how to remove smaller grains
I have a grain model which consists of lots of tiny grains and clusters of of larger grains. I am wondering how it is possible t...

4 meses ago | 3 answers | 0

3

answers

Question


Fitting line to a curve
I have a plot of attenuation V frequency and I am wondering if there is a way I can fit a straight line the follows the upper tr...

6 meses ago | 1 answer | 0

1

answer

Question


Attenuation as a Function of Frequency
I am wondering if anyone has any experience moddelling how attenuation of a material. I have made an attempt but my attenuation ...

6 meses ago | 2 answers | 0

2

answers

Question


Pre Selecting Figures to plot
When I run my script I have 10+ figures plotting. Rather than commenting them out, I was wondering if there is a way to set up a...

6 meses ago | 2 answers | 0

2

answers

Question


Zero Pad My FFT Signal and Window
Hi Everyone I want to know how I can zero pad my FFT signal to make it longer so that I can get better frequency resolution. In...

6 meses ago | 2 answers | 1

2

answers

Question


Hanning window on Imported data
Hi everyone I am trying to add a hanning window to my time signal before I FFT it. I am not sure exactly what do. Looking at...

6 meses ago | 1 answer | 0

1

answer

Question


FFT when rescaling data
Hi everyone I have been trying to use an FFT on my imported data. My Time step from my data wasn't equidistant so I tried to ...

7 meses ago | 1 answer | 0

1

answer

Question


Frequency plot not working properly when using IFFT
I have impoted an ultrasound signal to matlab and I was to look at this signal in the frequency spectrum, but I am not sure if ...

7 meses ago | 1 answer | 0

1

answer

Question


Normalising and rescaling my ultrasonic signal
I am exciting ultrasound in wateter which then gooes through the material. I want to notrmalise my signal in such a way that it ...

7 meses ago | 1 answer | 0

1

answer

Question


Legend isn't including all entries
Hi everyone I am getting another error when creating my legend as one of my entries aren't showing figure(03) plot(Time...

7 meses ago | 1 answer | 0

1

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Question


Error when creating legend
Hi everyone I am trying to print my legend on one of my figures as follows legend('Signal', sprintf('Amplitude = %0.04d', 9....

7 meses ago | 3 answers | 0

3

answers

Question


changing values in an array
I have a 1000x1 array that ranges from 1 to 179. Any values above 90 in this array I need to do 180 minus any of those values ...

alrededor de 1 año ago | 1 answer | 0

1

answer

Question


Magnitude of a matrix
I have a 1000 x 3 matrix where each column is associated the the x,y and z-direction. For each row I want to find the magnitud...

alrededor de 1 año ago | 1 answer | 0

1

answer

Question


Error in Matlab code
I have attached a picture of my code with error message. It was working yesterday and now it is giving me an error and I don't ...

más de 1 año ago | 1 answer | 0

1

answer

Question


How to get matlab to read the code
I have converted data from OnScale to matlab. I have been given a script which will read the data from this subfolder. The data ...

más de 1 año ago | 1 answer | 0

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answer