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Matt Kindig


Northwestern University Chicago

355 total contributions since 2011

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Answered
How to classify shapes of this image as square, rectangle, triangle and circle?
Another approach is to calculate the best-fit bounding rectangle of each object, such that the bounding rectangle can be oriente...

5 years ago | 5

| accepted

Question


Determine which function was used to generate hggroup?
Hello everyone, Is there a way to determine which function (e.g., quiver(), scatter(), contour(), etc.) was used to generate ...

5 years ago | 1 answer | 0

1

answer

Answered
How to average a column based on another column?
This is a good use of accumarray(): [ud,ix,iy]=unique( data(:,1)); output = [ud, accumarray(iy,data(:,2),[],@mean)...

5 years ago | 0

| accepted

Answered
How can I write a program to investigate whether a number belongs to matrix?
I think ismember() should do the trick: A=[1 2 3 5 21 2 4 0 11 3]; B = 11; C = ismember(B, A); %returns 1 B =...

6 years ago | 2

| accepted

Answered
Creating an array of datenum(s)
If I understand you correctly, this should do it: [~, time_index] = ismember( datenum(tv), second_tv);

6 years ago | 0

Answered
How to convert an image from rgb to lab by pixel by pixel matrix???
You can convert rgb to L*A*B colorspace using the makecform() and applycform() functions. From the documentation: cform...

6 years ago | 0

Answered
Is there a way to disconnect lines between data points while utilizing the plot function?
Another way is to insert a NaN between the dis-connected points, such as: x = [1;2;3;4;5;6;7;8;6]; y = [10;20;30;40;50;6...

6 years ago | 4

Answered
How to calculate the median for each day of the year in 91 years?
I think this is a good use of accumarray(). %some sample data, to illustrate approach Data = [1915 1 1 1000 1010; ...

6 years ago | 0

Answered
Finding minimum point from any function file input.
I would check out the documentation for fminsearch() and fminbnd(), or if you have the Optimization Toolbox, fminunc(): doc...

6 years ago | 0

Answered
How do I find values in a matrix which are closest to an integer which is the product of a given value?
I think I get what you are trying to do. I think the easiest way might be to use interpolation to fill in the missing values, as...

6 years ago | 1

| accepted

Answered
Read data from text file
You should be able to do it with textscan fid = fopen('/path/to/your/file.txt', 'rt'); output = textscan(fid, '%s %s %f ...

6 years ago | 2

Answered
and another "if" statement question
How long is the vector? Would this work? if all(A>3) %do something else %do other thing end

6 years ago | 1

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Answered
how to get some values from many text files and put them into the calculation ( please help)
One approach using regular expressions: %variables to average over AveVariables = {'Area', 'xbar', 'ybar', 'IXXw', 'IYY...

6 years ago | 0

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Answered
how to write program for following problem
I'm not going to given you the entire code, but to get you started, here's how you can do the parse: a = 'AD''BA''C'''; %...

6 years ago | 0

Answered
levenberg-marquardt in lsqcurvefit
Pass in an options structure: opts = optimset('Algorithm', 'levenberg-marquardt'); [parameters,resnorm,residual,exitflag...

6 years ago | 0

| accepted

Answered
Updating bounds in fmincon
You can implement the constraints on psi as a linear inequality constraint. If you check the documentation for your solver (e.g....

6 years ago | 1

Answered
How do I create variable names from string variables
If you can, avoid doing this. This explains why: <http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA...

6 years ago | 2

| accepted

Answered
Creating a matrix using a loop
[xx,yy]=ndgrid( -2:1:2, -2:1:2); xy = [xx(:), yy(:)]; x = xy(:,1); y = xy(:,2);

6 years ago | 1

| accepted

Answered
How to Multiply value in adjacent cell by cell above, Autofil formula in Matlab?
There is no generic "autofill" command. For the example you've given, the following logic would work: StartVar = 5; mult...

6 years ago | 1

| accepted

Answered
using multiselect uigetfile with dicomread
You probably need to pass in the full path to your DICOM file to dicomread(). Try this: for count = 1:numel(name) imag...

6 years ago | 0

| accepted

Answered
plotting normal vector in 3d
doc quiver3

6 years ago | 1

| accepted

Answered
Error using textread to read data containing "INF" or "NaN" with float data
Try using textscan() with the 'TreatAsEmpty' option: output = textscan([direct filename], '%22c %u %f %f %f %f %f %f %f %f ...

6 years ago | 2

Answered
How to read from a *.txt file to assign variables and paths
Easiest way is to parse with regular expressions and read into an output structure with named fields. %read in file str ...

6 years ago | 0

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Answered
Solving ODEs using matlab (ode45)
Did you forget the assignment sign? [T, XY] = ode45 ('diffxy', 0 10, [0 1 0])

6 years ago | 0

Answered
choose data points that nears each other and store in different matrix
One (non-loop) way: [x1,x2]=meshgrid(A(:,1)); [y1,y2]=meshgrid(A(:,2)); D = sqrt((x1-x2).^2+(y1-y2).^2); %distance m...

6 years ago | 0

| accepted

Solved


Read a column of numbers and interpolate missing data
Given an input cell array of strings s, pick out the second column and turn it into a row vector of data. Missing data will be i...

6 years ago

Solved


Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

6 years ago

Solved


Relative ratio of "1" in binary number
Input(n) is positive integer number Output(r) is (number of "1" in binary input) / (number of bits). Example: * n=0; r=...

6 years ago

Solved


Vectorizing, too easy or too hard?
Please insert a . before any ^, * or / in the string. That's it!!

6 years ago

Solved


Specific Element Count
Given a vector _v_ and a element _e_, return the number of occurrences of _e_ in _v_. Note: NaNs are equal and there may be n...

6 years ago

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