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creating a unique variable for the outputs of a for loop?
Since it is a function, the workspace is cleared when it's done running and only the output arguments returned. function [fin...

15 years ago | 0

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deriche edge detector
Never heard of Canny-Deriche, but there's a Canny filter in: doc edge

15 years ago | 1

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The Matlab reflectivity tool
They are probably in the Mapping Toolbox <http://www.mathworks.com/products/mapping/> (At least those were the only results fo...

15 years ago | 0

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Why do you come to "MATLAB Answers"?
['a':'c' 'f' 'i'] I've learned how to program in MATLAB pretty much exclusively from CSSM and Answers. The quick fun chall...

15 years ago | 2

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problem with for loop
w=0:60*(10^6/4096)+1:60*10^6 ; % [Hz] zl=50 ; % [ohm] zs=50 ...

15 years ago | 1

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Splitting up values from variables
Displacement(1) ? Seems too simple to answer your question.

15 years ago | 1

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How to plot with initially undefined number of lines in a .m file
doc varargin doc nargin Use one of the above to determine how many inputs there are, then use a for-loop to create that ...

15 years ago | 0

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Can I use symsum function (summation) for an image matrix?
An image matrix is just numbers and variables...

15 years ago | 0

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Answered
Thresholds in ODE solvers
Your function is returning dn. x isn't passed back so the last line doesn't do anything...

15 years ago | 1

Answered
How to align two images together automatically: Round 2
<http://www.mathworks.com/matlabcentral/fileexchange/18401-efficient-subpixel-image-registration-by-cross-correlation> You coul...

15 years ago | 1

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function
No. The command add may produce 'd' in its own function workspace, but when it is retrieved it is called 'b' because that's the...

15 years ago | 1

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Answered
polarized and non polarized images
[EDIT: 20110518 18:15 CDT - clarify - WDR] <http://www.google.com/search?q=what+information+from+polarized+illumination+with+an...

15 years ago | 0

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M-function in a M-script
That was covered in depth on CSSM. <http://www.mathworks.com/matlabcentral/newsreader/view_thread/298837>

15 years ago | 0

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Answered
Images to stacks
I = zeros(nRows,nCols,nTifImages,'uint8'); %preallocate block for ii = 1:nTiffImages %loop over image I(:,:,ii) = imrea...

15 years ago | 0

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Answered
How do I cut individual letters in the image bar code?
Use |bwconncomp| to group objects and then use |regionprops| with the 'image' option. Each image in the output from regionprops...

15 years ago | 0

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Error with image analysis
i is apparently a 2d image. what is j (size(i))? d = I > 160; %don't name your variables i,j as they are the sqrt(-1)

15 years ago | 1

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matrix plotting
scatter(z(1,:),z(2,:)) or scatter(z(1:2:end),z(2:2:end)) %Sorry misread your inputs

15 years ago | 0

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Answered
Vector dependance
No. However, if x,y are handles, toying with z could change the object being handled.

15 years ago | 0

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Answered
[DEPRECATED] What frustrates you about MATLAB?
plot(1:10,'b-',3*(1:10),'r') Throws an error. MATLAB, you know how to plot against indices when there is only one vector, ...

15 years ago | 1

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how to make arrows
doc quiver

15 years ago | 0

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Using unique.m function on NaNs
No. It's supposed to be a. By definition nans are not equal to themselves so they're not equal in rows either. isequal(n...

15 years ago | 1

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Answered
trouble using im2bw for image thresholding
level = graythresh(imagedata2); BWS = im2bw(imagedata2,level); If this doesn't work what are class is imagedata2? class(...

15 years ago | 1

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How to align images together automatically: Round 1
Once you know the displacement vector, use my |imtranslate| function <http://www.mathworks.com/matlabcentral/fileexchange/272...

15 years ago | 1

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Answered
workspace & GUI
That's because it's calling it in the workspace of the callback function, not the base work space. This is what you want: ev...

15 years ago | 0

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Answered
accessing surrounding elements in an array
%Boundaries included A2 = conv2(double(A),ones(3),'same')/9; idx = A > 200; %simulating you're threshold A(idx) = A2(idx); ...

15 years ago | 1

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Answered
how to convert an image to topography image?
To calculate the variance, take the square of the output of |stdfilt| doc stdfilt

15 years ago | 0

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calculating the average in a matrix
I = your_image; Ismoothed = cast(conv2(double(I),ones(3)/9,'valid'),class(I)); A windowing average is just a convolution with...

15 years ago | 0

Answered
extract matrix from for loop
m2 = repmat(m,[1 10]); or m2 = repmat(m,[10 1]);

15 years ago | 0

Answered
Logical Indexing for a slice of a 3D-Matrix
Obligatory timings :) MyMat2store = rand(1000,1000,3); MyMat1 = rand(1000)*10; t1 = 0; t2 = 0; t3 = 0; for ii = 1:30; My...

15 years ago | 0

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School Project
doc axis Specifically axis([0 50 0 50])

15 years ago | 0

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