Math Forum / Math Software / MATLAB / February 2010

Could somebody please clarify the following questions?
1. I have experimental data of current of one hour taken for every one second this is the input data.
2. For each input data I have a corresponding terminal voltage data recorded for every one second this is the output data ...

Hi Chaps
I hope you can help me. I am trying to use neural netowrks to help predict outcomes to control a rotating machine. I have never used them before so am starting with a simple problem and going on from there.
I have managed to use nntool and nftool to create a multiple ...

In my XPC target I need to do some rs232 packet communication. To start with, I made a simple model which includes Baseband Serial F block. I configured the model for COM1-none. Rx and Tx data types are 8 bit NULL terminated. I attached a ascii encode block with certain ascii ...

Hi im trying to cut down the execution time for my code
what im trying to do is search through a matrix that has zeros and ones.  When a one is found it selects the cell that is in the same position as the one in a different matrix ( both matrixes same dimensions) and basically ...

I have a matrix that in gray scale goes from 0 to 255 to represent an equation. The image is found here: http://drop.io/sqr5ooo
What I need to do is instead of making it a full range from 0 to 255 like in the image, I need to make all values between 0 and 63 63, 64 to 127 to 127, ...

I would like to hear your opinion about the impact on execution speed of a MATLAB application:
1) have all the files (around 100 .m) of the application stored in a local directory, on my PC, put as the first one in the path
2) have all the files in a network directory, that would ...

I recently upgraded matlab to 2009b version on a separate machine to test the code. I get some interesting results.
when i try to get eigen value for a correlation matrix, i get complex numbers in the 2009b version. but the same matrix yields real values in the 2007a version..
Any ...

Hi,
I'm trying to repeat a number of times a plot but with different data. Can anyone help me out?
I have a matrix X (3264,432) that is subdivided in days (192,432).
I also have a Repeat array that tells when I change from one day to the other i.e. [1 192 384 576 768 ...]

I have a set of radiographic images of an object taken at different angles. 180images to be precise (2 deg step). I know that the center of rotation did not match with the cg of the specimen accurately and therefore i want to shift each of the images with certain pixel value ...

Whether it is possible to add .001 noise variance to gaussian noise

Dear all,
I been looking for an example of Simulink for special task to convert video into image. The plan is to convert 1second of video into 15 frame of images. So, for 1 minute of video, there will be 900 frame of images.
Is there any special toolbox in simulink that can help ...

Hi all, I have a GUI which contains an axes which will display images that the user chooses from any directory. Using the window button down function, as long as the user clicks anywhere within the image, the coordinates will be displayed.
However, I realised that when I clicked ...

Hi im designing a wind tunnel and i have this curve for a part called the contraction.
Ive got this function F(x)=-1.7068x^3+1.96947x^4-0.60599x^5+0.45
im using the limits of x>=0 and x<=1.3
                           y>=0 and y<=0.5

Is there a way to return data to the command window while parallel processes are executing? I have run tests and know that parallel processes started with createJob() do not disp anything to the command window. Is there a way to peek into the job and either pull out a variable or ...

I have two big array of size Nx1 (call it X)
X=[1,2,3,4,5,6,7,8,9,10,11,12,...20,21,22]
Y=[1,1,1,1,1,2,2,2,2,2,1,1,...3.1,4,1,-1.1]
and I want to shrink it down by taking average of every 5 entries