Matlab

Problem with difference equation
Hi folks, I have to use difference equation to find second derivative of sin function. This is the function g1*sin(2*pi*t/T). I use approximation with central finite difference of second order with second-order accuracy. It's it fpp(x) = ( f(x+h) -2f(x) + f(x-h) ) / h^2.... When i wrote simple program to prove that th... 27 Jun 2010 09:32

npn transistor
how do i model for a npn transistor using simulink and find its transfer charactristics and its frequency response ... 27 Jun 2010 09:32

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Optimization using fminsearch
Hello All, Can anyone please help me with the problem below: I want to minimize this function: f(x,y) = p00 + p10*x + p01*y + p20*x^2 + p11*x*y + p02*y^2 + p30*x^3 + p21*x^2*y + p12*x*y^2 + p03*y^3. This is an equation of a surface plot. It has 2 variables (x,y). The range of x starts from 1.8e-09 and of y sta... 27 Jun 2010 23:46

convert time to seconds
Hi, I have a column matrix: V = '09:30:00' '09:30:03' '09:30:05' '09:30:09' .... I want to convert it to seconds(from midnight), it is it should effectively become 34200 34203 34205 34209 .... (3600sec * 9.5hrs = 34200) I can't think of a clever way to do it. It would be great if you could sug... 27 Jun 2010 13:54

csvread doesn't seem to work
Hi, I have a csv file. I use csvread to read the file: M=csvread('AAPL.csv'); I get the following error: ------------------------------------------------------------------ ??? Error using ==> dlmread at 145 Mismatch between file and format string. Trouble reading number from file (row 1, field 3) ==> :30:0 ... 27 Jun 2010 13:54

PIL co-simulation runs too slow
hi, guys, I found that PIL co-simulation runs so slow that it seems impossible to get finish. I thought it was my model's problem, maybe I did it wrong. Then I went to the training demo video made by Mathworks about PIL co-simulation, it turns out that the execution of PIL is slow too in that video. For like 10 s... 28 Jun 2010 06:14

mex to m file??? possible??
hello everyone here. i want to know is it possible to convert .mex to .m file? waiting for reply ... 4 Jul 2010 15:33

Saving a function data to a text file
I want to know how I can save the data of the following output function into a an external text file. But I am getting this problem, ??? Error using ==> fwrite Cannot write value: unsupported class sfit Error in ==> Read_Multiple_Photos at 148 fwrite(fid,createSurfaceFit(rows,columns,intensity_1), '\n'); ... 28 Jun 2010 03:01

turn off tex interpreter globally?
Hi, I would like to turn off the tex interpreter for text globally, not per function where it is a problem. Does anyone know how to do this? For example, title('tex_example','interpreter','none') gives me a plot title exactly per the string given ('tex_example') whereas, without the interpreter set to none, th... 26 Jun 2010 22:49