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find all zeros
You can use |roots|, for example for x^2-1=0 roots([1 0 -1]) http://www.mathworks.com/help/techdoc/ref/roots.html

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subplot axis scaling
You didn't specify x axis, that's why the x axis becomes the indices. Just do plot(y1,a)

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In an assignment A(I) = B, the number of elements in B and I must be the same.
I don't quite know what your intention is, but the left side is a scalar and the right side in general is a vector, could be sca...

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Undefined function or variable when using load and trying to operate with variables
The first variable in |save| is the file name, not the variable name. So in each of your files, the variable name is still |z|. ...

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alternative to diff(X)
x = 1:10; x(2:end)-x(1:end-1)

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day of the week in a month
You want to use if any(x==[2 9 16 23 30]) and so on. Also at the bottom, you seem to have an extra |else| hanging around...

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Vectorization of this loop
x1=0; y1=1; inj_x=round(xwidth/2.0); inj_y=round(ywidth/2.0); [x2,y2] = ndgrid((1:ywidth)'-inj_y,(1:xwidth)'-inj_x...

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Why my butterworth low pass filter doesn't work?
I don't understand. I modified your code a bit to do * Use filter operation in time domain * Use 200Hz as cutoff frequency ...

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Why my butterworth low pass filter doesn't work?
Please format your code. But just a quick note, if you set cutoff frequency at 300Hz, the 300Hz component will not be eliminated...

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help using fgetl function???
you should use while ~feof(fid)

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envelope function
For a signal x, you can use the following code to get the envelope t = 0:0.01:1; x = exp(-t).*sin(2*pi*10*t); plot(t,...

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Contour a log fuction with n contour levels
There are negative numbers in log so the result may be complex. In addition, there is zero in log, so log(0) gives infinity, whi...

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Levinson algorithm
Hi Shweta, It is true that the algorithm only solves n unknowns, but if you look at the reference page below, the returned re...

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Traping Error user input
Is this what you want? n=inputdlg('Please input a number more than or equal one:') while isempty(str2num(n{1})) || str2n...

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How do I create a vector with a multiply sequence?
Another one flipud(100*diag(vander(repmat(0.7,1,10))))

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How do I create a vector with a multiply sequence?
Just for fun filter(1,[1 -0.7],[100 0 0 0 0 0 0 0 0 0])

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slicing multi-dimensionsal arrays
In your code, you only passed on data input to |cat|. You can try the following cat(1,ary3d(2,:,1),ary3d(2,:,2),ary3d(2,:,3)...

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Plotting 2 Matrices
You can try surf(matrix1,matrix2) and see if that's what you want.

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loglog graph analyses
loglog uses 10 based logarithm for both X and Y, so if the resulting figure is a straight line and you want to calculate the slo...

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Fourier Transform of Swept Sine Signal
Looks to me within 2 seconds your signal sweep from 0 to 800Hz, so it's not really a 400 Hz sweep. Given your signal is real, it...

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The question about signal power in watts
I assume your signal, |y|, is the voltage signal in volts, and the load is 1ohm, then the power is 0.5 watts Here is an examp...

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A little bit tricky 2d plots
1. plot([A B C]); 2. plotyy(X1,[A B],X2,C); but because MATLAB always do the x axis from smallest to largest, ...

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All capital?
Are all the letters in the input string capital letters? Examples: 'MNOP' -> 1 'MN0P' -> 0

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Changing the figure font
x = 1:10; plot(x,'LineWidth',4)

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An error at modulation process
It seems taht your evelope1 is derived from the input sound, while your car1 has the dimension of t, so the two don't match in s...

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3d-dwt
You may also find the following demo useful http://www.mathworks.com/products/wavelet/demos.html?file=/products/demos/shippin...

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Making function to calculate value when user inputs date
I think you need more information. Given only month and date, how can you figure out the weekday information? Or is it for a giv...

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The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

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Binary numbers
Given a positive, scalar integer n, create a (2^n)-by-n double-precision matrix containing the binary numbers from 0 through 2^n...

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The Goldbach Conjecture
The <http://en.wikipedia.org/wiki/Goldbach's_conjecture Goldbach conjecture> asserts that every even integer greater than 2 can ...

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