# Ben11

### Université Laval

I'm interested in microscopy, neuroscience and image processing.

Professional Interests: microscopy, image processing

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**Content Feed**

How to generate surface of fixed width from know coordintes of curve and add pixel covered by the surface

This should do it: clear clc close all %// Define x and y to plot curve x=-10:10; y=-x.^2; %// Bu...

8 years ago | 0

MATLAB R2014A - Undo/Redo buttons

Just to complement Sean's answer, they are supposed to be at the top right corner of the window right aside the search box. H...

9 years ago | 13

How do i convert an image plot to a matrix.

Maybe I misunderstood but you might want to use getframe and get the cdata property: Example: x = -10:10; y = x.^2; ...

9 years ago | 0

Please help me make this easy plot work

Please format your code in the question. The error occurs because MATLAB does not recognize 3t as an expression. You need to ...

9 years ago | 0

Problem merging two images

This will work: clc clear close all I = imread('peppers.png'); [height, width,Channels] = size(I) bl...

9 years ago | 1

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i have an output of the following code...but i need to do haar wavelet transform of that output.PLEASE HELP ME IN CODING

You can use <http://www.mathworks.com/matlabcentral/fileexchange/40661-haar-wavelet-transform this> submission from the File Exc...

9 years ago | 0

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How do I show relative frequency on histogram?

The relative frequency is supposed to show up on the y-axis... what about this: clear all data= 10*rand(1,1000); ...

9 years ago | 0

mcc compiled executable didn't work!!

I think that's because, as trivial as it may sound, the disp command is used to display stuff in the Command Window, which is no...

9 years ago | 0

imfinfo unable to open a file

It looks like you try to open a directory instead of an image. I tried your syntax and got the same error. What if you try so...

9 years ago | 1

In the program below, the loop stops at theta(4). It will be a great help if you can please help me to rectify the error.

Initialize your array theta and change the upper limit of your for loop like so: theta = zeros(1,30); theta(1)= inpu...

9 years ago | 1

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Read value from a graph

Not sure to understand how you would like to 'enter' the value of x, but here is a very simple example: User_x = inputdlg('...

9 years ago | 1

how to draw a horizontal line at 63% of process curve, and vertical line to intersection of process curve, on a plot?

Add these lines after your call to plot: line([0 10],[15.75 15.75],'Color','k','LineWidth',2) % Horizontal line line([10...

9 years ago | 0

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Passing data between axes

You can: 1) Create a dummy original image and store it in the handles structure of your GUI. handles.DummyImage = Ori...

9 years ago | 1

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How to check in which step MATALB code is running?

You might also want to look into <http://www.mathworks.com/help/matlab/ref/dbstack.html dbstack>, which tells you the actual lin...

9 years ago | 0

i got an error as Warning: Ignoring extra legend entries

What if you use: legend([h1(1);h2(1);h3(1)],'f1=30','f2=120','f3=400','fontsize',10); Just an idea; h1, h2 and h3 might ...

9 years ago | 0

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Help with edit text GUI

At the beginning of this button's callback, use something like this: set(handles.edit3,'String','') which displays an em...

9 years ago | 0

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What's the best format to export figure?

Look at the <http://www.mathworks.com/help/matlab/ref/print.html print> function, with which you can export figures in eps or pd...

9 years ago | 0

how to change the font size in a plot (only for the axes numbers)?

Use the 'FontSize' property of the current axes: set(gca,'FontSize',20)

9 years ago | 9

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How to extract the value pixel values from an image or masked image?

You can get the histogram of pixel values using <http://www.mathworks.com/help/images/ref/imhist.html imhist>. For example: ...

9 years ago | 0

help with for statement

Adding an index to Pfwm and m might do the trick; with an alpha of 0.5 (arbitrary value) it did not give an error when I tried i...

9 years ago | 0

How can I get more tick marks/precision plotyy()'s y-axis using set() or simple method?

Yes you can set the Tick marks like this: set(gca,'XTick',Begin:Increment:End); so you can customize through the Increm...

9 years ago | 3

display value in message box

You can use sprintf to format the message: Message = sprintf('The value selected is %d\n',a); h = msgbox(Message)

9 years ago | 0

Matrix Dimensions must agree

You're missing a "." in your division: x = [0:0.01:10]; gx = 1-(2./x.^2); plot(x,gx); axis([-1,12,-1,12])

9 years ago | 2

how to plot two graphs combined

Maybe something like this: x=linspace(0,1,50) g=10; A=0.33 M=0.125 s=(A-0.5)*M.*g-(A^2)/4; theta=s./(2...

9 years ago | 0

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Problem with a conversion into avi file

You just need to convert sub_movie(:,:,k) to a double before exporting. For example: for k = 1:number writeVideo(wr...

9 years ago | 1

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Bar Graph with varying widths

For your 2nd question: In order to change the bar colors, use findobj to get the patch objects forming the bars and change th...

9 years ago | 0

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eigenvalues and orthonormal eigenvectors

Yes there is. Look at the <http://www.mathworks.com/help/matlab/ref/eig.html eig> function.

9 years ago | 0

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How can I display image size, dimensions and color type in the GUI?

You can get the information about an image file using <http://www.mathworks.com/help/matlab/ref/imfinfo.html imfinfo>, which out...

9 years ago | 3

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how can I concatenate cropped images from a folder?

Here is a bit of code to get you going. It creates a dialog title to allow the user to select the folder containing tiff files (...

9 years ago | 1

Help with GUI callback - existence condition

You can check for the non-existence of a variable using this line: if ~exist('a','var') % Code else % ...

9 years ago | 0