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# Daniel kiracofe

56 total contributions since 2014

Vibration and Signal processing tutorials at http://www.mechanicalvibration.com

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could u give me weiner program to remove audio noise
Did you try typing "Wiener filter matlab" into google first? There are all kinds of examples out there. Why don't you try that ...

etwa 3 Jahre ago | 0

Store tensor history into multidimensional array
As far as I am aware, it is not possible to do what you want in matlab. There is no such thing as a 3-dimensional array literal...

etwa 3 Jahre ago | 0

Can you help me out on making the BER vs SNR plot ?
Not 100% sure of the final answer here, but based on your statement that you are only getting 1 star on the graph, I assume that...

etwa 3 Jahre ago | 0

retrieving the impulse response of a function using freqz (not impz)
I suspect your problem is that the system you are trying to study is unstable. i.e. the pole lies outside the unit circle, so t...

etwa 3 Jahre ago | 0

Faulty result on contour map
Not 100% sure what you mean by "some values are false", but I suspect that you've just transposed x and y axis. Does a = ...

etwa 3 Jahre ago | 0

Error with if elseif statements
In matlab, strings are arrays of characters. Two strings with different lengths have different array dimensions. e.g. 'dog'...

etwa 3 Jahre ago | 0

How do I set counter = to a value when it is a persistent variable so if i reinitialize it each time through a loop it loses it purpose?
I'm not sure if I understand the question. Here is my guess at what you are asking. If this isn't it, please restate the quest...

etwa 3 Jahre ago | 0

How to use anonymous functions and fsolve to find initial conditions given final conditions (projectile motion)
So it looks like you are integrating an ODE numerically. Starting from a set initial conditions, you are doing a simple time in...

etwa 3 Jahre ago | 1

How to save a huge matrix efficiently?
If you have enough memory and are using a 64 bit version of matlab, using load() to load the entire matrix into memory will be q...

etwa 3 Jahre ago | 0

Using interp1 multiple times to find a root : interp1 on a matrix without loops. Using interp1 multiple times for different values of query points without loops.
My first question here would be, are you pre-allocating root? i.e. do you have root = zeros(a,b,c) before your loop? If not, t...

etwa 3 Jahre ago | 0

how to plot a unit step function
Do you want to do this numerically or symbollically? With the symbolic math toolbox, the heaviside() function is a unit step....

etwa 3 Jahre ago | 0

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The code does not return the unwrapped phase. Why?
Not 100% sure I have the whole answer, but here's part of it. Look at these two lines side by side: %by first sequentially...

etwa 3 Jahre ago | 1

Divide image into 3x3 pixels?
Depends. First, define "small" and "big". Do you mean it's okay for 10x10 but too slow for 1000x1000? Or does big mean 100,00...

etwa 3 Jahre ago | 0

how to make table of ip address numbers
strsplit() will split up the strings for you. Then use sprintf() to make the formatting https://www.mathworks.com/help/matla...

etwa 3 Jahre ago | 0

While loop not working
I see two issues with your code: 1) By virtue of the fact that you have "while j <9" at the top, this implies that you expect...

etwa 3 Jahre ago | 0

How to round (or convert) an array to integer?
ceil() should work to round up to the nearest integer

etwa 3 Jahre ago | 1

Round to specified decimal number?

etwa 3 Jahre ago | 0

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ploting in for loop
"there is something wrong" is pretty vague, so I'm totally guessing at what your problem is. But this seems like a reasonable gu...

etwa 3 Jahre ago | 0

Why do I get this error: A(I): index out of bounds; value 2 out of bound 1 (line 13)
Because the very first time the while statement's condition is checked, n=2, and x is a vector that has 1 element. You are aski...

etwa 3 Jahre ago | 0

How to determine a frequency that contains 90% of the power of the signal?
1) create a power spectrum (i.e. using the results of fft()). I'm assuming you know how to do this, if not just ask 2) create...

etwa 3 Jahre ago | 0

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sinewave generation:how generatea sine wave
t=0:0.001:1; freq = 10; signal = sin( freq * 2 * pi * t); plot(t, signal);

etwa 3 Jahre ago | 0

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HELP with creating matrix for Jacobi and Gauss-Seidel method problem!!
the brute force approach would be something like this. for i = 1:80 for j = 1:80 if (i==j) a(i,j) =...

etwa 3 Jahre ago | 0

I want to copy the rows of G1 to G2 in inner for loop but error occurs , please help
the first time through the loops, k = 15. but size(G1) is 11x16. So the first time you are effectively doing G2(o,:) = G1(1...

etwa 3 Jahre ago | 0

simulating a poker game
You've got a good start. Here's a few comments 1) Instead of using randsample() and then finding and removing elements from t...

etwa 3 Jahre ago | 3

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How to plot spectrogram in Matlab using one-year length data with the sampling rate of 50 Hz?
if you don't really need 50 Hz resolution, then use decimate() to make the vector length smaller. If you really do need 50 Hz...

etwa 3 Jahre ago | 0

How to use fft2 and find spatial wavenumbers (kx & ky) ?
First, you need to reshape your data so that it is 10000x5x5 instead of 10000x25 ("reshape" command could help here). Then, a...

etwa 3 Jahre ago | 1

I need to sum the values around the perimeter of a matrix, is there sum function in matlab

etwa 3 Jahre ago | 0

Plot double Fourier series in MATLAB
I think your problem is this line A=4*(-1)^(m+n)*(sin(m.*x)*sin(n.*y))/(m*n); from the way you have written it, it looks l...

etwa 3 Jahre ago | 0

Question on designing a filter to remove noise from a audio signal
step 1: analyze the signal and see if you can determine what frequencies are to be kept and what frequencies are to be discarded...

etwa 3 Jahre ago | 0

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