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# Joel Handy

28 total contributions since 2019

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Answered
how to plot all the results of for loop in one figure on same axis?
Just move the figure(); command to before the for loop.

5 months ago | 0

Answered
How to flip my image
The are a few problems with your code. First, if you want the image, you dont want to transpose. That will flip and rotate, As...

5 months ago | 0

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Answered
How to split an array into smaller unequal-sized arrays dependend on array-column values
Histcounts can be used to pin the data the way you want. [~,~,BIN] = histcounts(mainArray(:,1), 0:10:500) subArray1 = mainArr...

5 months ago | 0

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if statement inside for loop location issues
This is exactly the situation where you want to use logical indexing. https://blogs.mathworks.com/loren/2013/02/20/logical-inde...

5 months ago | 0

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Plotting orientation in 3-D plot using quaternion
Check out this link which explains the quaternion mah required. https://gamedev.stackexchange.com/questions/28395/rotating-vect...

5 months ago | 0

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How can i read multiple values in a string?
I believe a regular expression along these lines is what you are looking for. data = regexp('1º:" H:2T:16799C:7| H:2T:16803C:15...

5 months ago | 0

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Answered
Surface fitting for 3D point cloud acquired by photogrammetry
Take a look at griddata and scatteredInterpolant griddata Interpolates scattered data - generally to produce gridded data Vq =...

5 months ago | 2

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Can this be written in a much better way for fast computations?
The code below will do what you are asking without needing a loop. coast=magic(14400); di_max=100; mx=14400; my=14400; [i...

6 months ago | 1

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Answered
How to assign numbers
Something like this? table = randi([0 10],10,10); tableMax = max(max(table)); table(table==0) = tableMax+1; % Or Just table...

6 months ago | 0

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How can i do object oriented programming in Simulink?
It sounds like a simple masked subsystem may suit your needs. Its not object oriented programming but you can use it to define ...

6 months ago | 0

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How could I extract the first two columns, and leave the next two and then so on from a matrix
% Set up example data set A = eye(100); A(1,:) = 1:100; numCols = size(A,2); % Answer B = A(:,sort([1:4:numCols 2:4:numCo...

6 months ago | 0

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Answered
A simple matrix question
A = [1 2 3 4 5]; B = fliplr(A) % Flip matrix in left/right direction A = [1; 2; 3; 4; 5]; B = flipud(A) ...

6 months ago | 0

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Answered
how can i convert the ip address into decimal
ipFields = uint8(str2double(split('192.192.192.2', '.')))'; typecast(fliplr(ipFields), 'uint32') % Explanation dec2hex(192)...

6 months ago | 0

Answered
unique set from file
c = {'!' 'a:' 'l' 't' '@' [] [] '?' 'a:' 'l' 't' '@' 's' 't' '/' 'a' 'b' 'a' 'n' 'd' 'A~'}; for rowIdx = 1:size(c,1) ...

6 months ago | 0

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How to divide a structure into sub-structures based on a condition
I think this is what you are looking for. You will end up with two struture arrays both smaller than the original structure arr...

6 months ago | 0

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What are the toolboxes on my license
Just type "ver" to find out what toolboxes you have ver This question has a pretty thorough description of product activation ...

6 months ago | 0

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Issue with loading datetime from table
There appears to be two issues with your code. The first is that datetime doesn't take a cell array of numbers so you need to c...

6 months ago | 0

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How do I apply unique names to structs created in a for loop?
Does this help at all? I'm not completely sure I understand the nuances of your question, but If I had a folder structure like ...

6 months ago | 0

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Finding a max in a column and making all other elements equal to zero
a= [ 1 3 3; 3 1 2; 2 1 1 ] numRows = size(a,1); maxvals = max(a) a(a~=repmat(max(a),numRows,1)) = 0 numNonZeroInCol = sum(...

6 months ago | 0

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Answered
Undefined function or variable 'gurobi_write'. in MATLAB R2019a?
I don't know anything about Gurobi, but I do know that in the past, some programs that tie into Matlab need to be installed afte...

6 months ago | 1

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Answered
How to select images from nested folder?
Something like this should work. You will possibly need to add code to appropriately sort your list of images. I've marked whe...

6 months ago | 1

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Answered
Change the certain element after comparison of two arrays
B = A == 0;

7 months ago | 0

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Answered
How do I add an additional column to a cell array based on existing values in another column?
Obviously replace myCellArray with whatever your array is called. isTwo = cellfun(@(x) x == 2, myCellArray(:,2)); myCellArray(...

7 months ago | 0

Answered
Remove rows based on length of column value
I think this code will do what you want. It will make a vector with the same number of rows as A, with each element being the nu...

8 months ago | 1

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How to plot IMU data (XYZ_AER)?
A quiver plot might help you. it essentially lets you draw vectors in 3D space. https://www.mathworks.com/help/matlab/ref/quiv...

8 months ago | 0

Question

path(pathdef) does not reset the matlab path
I know the question, "How do I restore the Matlab path to it's state at program start up," has been asked a million times and fo...

8 months ago | 0 answers | 0

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Answered
Translating points and finding correct normal vector
Sounds like what you really want to do is "shrink" your perimiter. Is that accurate? If so, projecting points back along these...

11 months ago | 0

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Question

How can I easily give all of my simulink random number generators different but controlable seeds?
Simulink random number blocks, as one would expect, output the exact same stream of numbers given the same seed. This becomes p...

11 months ago | 1 answer | 0

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