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Jonas Reber


Last seen: 5 months ago |  Active since 2011

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Question


Matlab exponent bug?
Hello MatLabers I have encountered a problem when calculating a non integer exponent/power of a variable. example: ...

13 years ago | 3 answers | 1

3

answers

Answered
eigen faces
Eigenfaces are eigenvectors. When performing principal component analysis (PCA) on a set of images showing human faces, the pri...

13 years ago | 0

| accepted

Answered
when using copyobj() with a contour, changing properties of the copy has no effect
mathworks technical support confirmed that this is a misbehaviour and that it will be resolved in a future version.

13 years ago | 0

| accepted

Answered
Calling another program
you might be looking for system('command') [status, result] = system('command') [status,result] = system('command','-...

13 years ago | 0

Answered
Assigning data to variable names in a vector during a for loop.
yes this is possible. you could use the command "eval" that comes with matlab. have a look at the documentation. for your c...

13 years ago | 1

| accepted

Answered
how to use fread function?
have a look at the documentation of fread: http://www.mathworks.ch/help/techdoc/ref/fread.html you might be looking for: ...

13 years ago | 0

Answered
How to save an image displayed ?
have a look at the solution I provided in your second question. it should answer both: http://www.mathworks.com/matlabcentral/a...

13 years ago | 0

Answered
How to recostruct ROI on an image and diaplay it?
after having read your first question ( <http://www.mathworks.com/matlabcentral/answers/18789-how-to-save-an-image-displayed>) I...

13 years ago | 1

Answered
Update to R2011b breaks call to addlistener
does the event exist on the "figureHandle"? get(get(classhandle(handle(figureHandle)),'Events'),'Name') what if you tr...

13 years ago | 0

Answered
size of image
how did you store your images? is it a 2d matrix? did you store it like: (N images of size 3 by 4) 1 1 1 1 1 1 1 1 1 1 1 1...

13 years ago | 0

Question


when using copyobj() with a contour, changing properties of the copy has no effect
Hello MatLabers I'm using a contour plot on several axes. Since I have quite an amount of points, the calculation of the cont...

13 years ago | 1 answer | 0

1

answer

Question


Multiple Callback Functions
Hello MatLabers I'm trying to have multiple callback functions executed on a uicontrol callback function. Usually I go so...

13 years ago | 5 answers | 1

5

answers

Answered
Competing algorithms for SNR of a image. Which is better?
I would go for method 2 (3 is the same?) but wouln't one calculate SNR = mean2(im)/std(im(:))?

13 years ago | 0

Answered
2D projection in a 3D plot
something similar has just recently been asked: http://www.mathworks.com/matlabcentral/answers/8752-get-projection-image-witho...

13 years ago | 1

Answered
manipulate pixels in an image
if you don't have it you could take a look at e.g. http://www.mathworks.com/matlabcentral/fileexchange/4658-updownsample

13 years ago | 0

Answered
Data sets from image
does it help if I provide you the following code as an example...? %% Two Dimensional DFT Example % 1.Load the sample ...

13 years ago | 1

| accepted

Answered
RGB to HSV image
does the rgb2hsv function not work? I do it that way..., hsvimg = rgb2hsv(rgbimg); ... do something ... (like saturat...

13 years ago | 0

Answered
Image Processing: Remove double edges
you could take another derivative (2nd) and only keep the positive values 1 0 1 => 0 -1 1 (depenting on the direction you are...

13 years ago | 0

Answered
subscript mismatch
maybe this one answers your question: http://www.mathworks.com/support/tech-notes/1200/1207.html#5 you try to assign/access...

13 years ago | 0

Question


iptPointerManager significantly slows program down
Hello MatLabers As recently I was looking for a method to have a mouse over (mouse hover) effect on my graphics objects (drag...

13 years ago | 1 answer | 0

1

answer

Answered
Code's improvement (plots animation)
the problem is that getframe as used by you gets the current figure as it is. If you maximize the window and "record" the movie ...

13 years ago | 1

| accepted

Answered
get projection image without rendering to screen
you could calculate the perspective projection of your model yourself as you have all the information on camera position, look a...

13 years ago | 2

| accepted

Answered
Trouble with ButtonDownFcn and Hittest in GUIDE
this looks reasonable to me. have you tried ThePlot = plot(xvalues, yvalues, 'Parent', handles.TheAxes, 'Tag', 'ThePlotTag'...

13 years ago | 1

| accepted

Answered
I can not use libsvm!!!
I used libsvm myself in matlab. * download it from ( <http://www.csie.ntu.edu.tw/~cjlin/libsvm/#download>) * add the svmtrain,...

13 years ago | 5

Answered
Creating an inline-function in dependence of a parameter
maybe str2func is what you are looking for?

13 years ago | 0

Question


Contextmenu Callback to set class variable
Hello MatLabers I am looking for a better/smoother way to implement the setting of a class variable in a callback. I'm sure t...

13 years ago | 1 answer | 0

1

answer

Answered
Seeded Region Growing Method
what about the FE submission: http://www.mathworks.com/matlabcentral/fileexchange/19084 ?

13 years ago | 1

Answered
detecting circular Objects
have you had a look at: http://www.mathworks.com/matlabcentral/fileexchange/9833-hough-transform-for-circle-detection

13 years ago | 0

Answered
Multiple colormaps within the same image
Have you looked at <http://www.mathworks.com/help/toolbox/images/ref/subimage.html |SUBIMAGE|>? You can specify different color...

13 years ago | 1

| accepted

Question


Get Unique Instance Identifier
Hello MatLabers How do I get the unique object identifier of an object (i.e. the handle)? I have several objects in a cell arr...

13 years ago | 1 answer | 1

1

answer

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