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Matt Kindig


Northwestern University Chicago

自 2011 起处于活动状态

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已回答
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...

10 years 前 | 6

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提问


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 ...

11 years 前 | 1 个回答 | 0

1

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已回答
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)...

11 years 前 | 0

| 已接受

已回答
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 =...

11 years 前 | 2

| 已接受

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

11 years 前 | 0

已回答
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...

11 years 前 | 0

已回答
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...

11 years 前 | 7

已回答
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; ...

11 years 前 | 0

已回答
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...

11 years 前 | 0

已回答
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...

11 years 前 | 1

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已回答
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 ...

11 years 前 | 3

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

11 years 前 | 1

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已回答
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...

11 years 前 | 0

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已回答
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'''; %...

11 years 前 | 0

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

11 years 前 | 0

| 已接受

已回答
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....

11 years 前 | 1

已回答
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...

11 years 前 | 2

| 已接受

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

11 years 前 | 1

| 已接受

已回答
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...

11 years 前 | 1

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已回答
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...

11 years 前 | 1

| 已接受

已回答
plotting normal vector in 3d
doc quiver3

11 years 前 | 1

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已回答
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 ...

11 years 前 | 2

已回答
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 ...

11 years 前 | 0

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

11 years 前 | 0

已回答
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...

11 years 前 | 0

| 已接受

已回答
rotate 3D plane to a new 2d coordinate system
Simplest way is just using a transformation matrix. %assume points are Nx3, where N is number of points. %let first poin...

11 years 前 | 1

| 已接受

已回答
How can I extract the first non-zero in several specific segments of the same matrix?
ix1 = find(x(1:3,2),1,'first'); %index of first non-zero in x(1:3,2); x1 = x(ix1,1); %corresponding first-column value ...

11 years 前 | 0

| 已接受

已回答
Saving outputs to different folder than m-file.
%get the directory of your input files: pathname = fileparts('/input/file'); %use that when you save matfile = fullfi...

11 years 前 | 3

| 已接受

已回答
I need to remove every other 9 rows of a matrix
So, to confirm, you need to do the following: * remove rows 1-9 (9 rows) * retain rows 10-19 (10 rows) * remove rows 20...

11 years 前 | 0

已回答
how to count the no of words in a sentence?
txt = fileread('hello.txt'); %read in file, assuming it is not too big sentences = strtrim(regexp(txt, '[\.\?\!]+', 'split...

11 years 前 | 0

| 已接受

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