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Manny Kins


Last seen: 4 months ago Active since 2018

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Question


Filling a region of a grayscale image with a colour corresponding to colorbar
Hi all, I have a task in which I want to draw around certain areas of an image and fill those areas with a semi-transparent colo...

1 year ago | 1 answer | 0

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answer

Question


Mapping two sets of co-ordinates with two different colours onto blank white screen
Hi, I have a blank Screen with dimensions: Screen = 255*ones(1024,1280,3); Where 1024 and 1280 are the height and width and 3 ...

1 year ago | 1 answer | 0

1

answer

Question


Finding intensity of region inside a circle from image
Hi all, I have this image below of a circular bead (also attached): I would like to calculate the average intensity of all p...

1 year ago | 1 answer | 0

1

answer

Question


Finding the full width half maximum (FWHM) of a rounded part of peak instead of sharp peaks
Hi, I have this plot where I want to find the FWHM around the main "bulge" of the plot (around the red line I have crudely dra...

1 year ago | 1 answer | 0

1

answer

Question


Plotting colourful line over gray image whilst retaining colourbar information
Hi, I would like to plot a colourful trajectory on top of a grayscale image whilst retaining the colour information of the traje...

1 year ago | 1 answer | 0

1

answer

Question


Curve fitting with loglog data
I am having some issues fitting a curve using polyfit to log data. I think I am making a silly mistake during the fit plotting a...

1 year ago | 1 answer | 0

1

answer

Question


Removing data from a structure that is less than a certain threshold
I am running a code to find the positions and trajectories of microparticles. I get a lot of noise as my particle concentration ...

3 years ago | 2 answers | 0

2

answers

Question


Finding length of a struct, excluding NaN values
I have a struct with the following layout: T X Y [0,1] [0, 1] [0,5] [0] [2] [2] NaN NaN NaN NaN NaN NaN N...

3 years ago | 1 answer | 0

1

answer

Question


Help optimising code that creates linked particle trajectories from single particle positions in each frame
The code below takes particle positions that I have found in each frame of a video and compares nearest neighbours to build part...

3 years ago | 1 answer | 0

1

answer

Question


What are the thought processes that go on when you are trying to solve a MATLAB problem?
I am (fairly) new to MATLAB, just started using it more heavily these past few months (before then I just used it to make basic ...

4 years ago | 1 answer | 0

1

answer

Question


Removing NaNs from a struct
I have a struct with the following layout: T X Y [0,1] [0, 1] [0,5] [0] [2] [2] NaN NaN NaN NaN NaN NaN N...

4 years ago | 3 answers | 0

3

answers

Question


Making a video showing trajectories of particles
I have some X, Y and T (time) co-ordinates for my particles (attached) and I want to plot and make a video of all of my particle...

4 years ago | 2 answers | 0

2

answers

Question


Removing unique numbers whilst comparing two structures
I have two structs, one called AllPositions_CA with X and Y fields containing this type of layout: X ...

4 years ago | 1 answer | 0

1

answer

Question


Finding circles in clusters
I have this image of spherical particles with varying shades. I wanted to find a way to find the centers of all of them (es...

4 years ago | 0 answers | 0

0

answers

Question


Finding arrays above threshold value
I have a struct AT.AX AX has the following values: 1x370 double 1x1007 double 1x3957 double 1x6309 double 1x1648 double ...

4 years ago | 2 answers | 0

2

answers

Question


How do I remove NaN values from a matrix and retain matrix shape?
Say for example I have the following array X = [1 3 4; 5 6 8; NaN NaN NaN] X = 1 3 4 5 6 8 ...

4 years ago | 1 answer | 0

1

answer