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Weibull 0 time failures
I assume you were trying to fit the data using something like parmhat = wblfit(data); I tried a few experiments and it d...

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plotting energy as a function of angles
Sounds like you want a polar plot like <http://www.mathworks.com/help/techdoc/ref/polar.html polar> or <http://www.mathworks.com...

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Awkward copy/paste question
If your two vectors are |v1| and |v2|, use: v2(isnan(v1)) = nan;

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Counting zeros
In general, no. You can try doing it by counting sign changes, but there is no guarantee you'll catch all the answers. However, ...

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Differentiation Of A Function.
You could do the following (I tack |num| onto the name to indicate it is numerical, not symbolic): Xnum = linspace(-1,1,128);...

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lsqnonneg
x = C\d; *EDIT*: The least squares estimate for |x| is xhat = (C'*C)\(C'*d); You can estimate the error in the fit as fol...

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General question about how do I loop this process?
It depends. If you want just line 2645, you could do the following: for ii=1:2644 fgetl(fid); end tline = fgetl(fid);...

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error in plotting lyapunov exponent from time series
Is |lyap| supposed to be a variable or the function in the Control Toolbox? If the former, you can't index it with |t| and |x| b...

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Multiple Answers From 'solve'
syms theta2 theta4 S=(-4.19*sin(theta2*pi/180)-5.166*sin(theta4*pi/180)+23.3*sin(82.99*pi/180))^2+(-4.19*cos(theta2*pi/180)-5....

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How to use who within eval
This is a working example: clear x = zeros(10,1); y = x; save matlab.mat file_name='matlab.mat'; eval('file_length = length(w...

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Calculating standard deviation from a confidence interval?
If the underlying distribution of the coefficients is normal, the 95% confidence interval is [mean-2*sigma,mean+2*sigma], so the...

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Constraining a fitted curve
Tricky. Suppose that your fit is y = p(1)*x^3 + p(2)*x^2 + p(3)*x+p(4); You'll need to ensure that the first derivative y...

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Getting divergence of a 3D pointcloud
You have worse than a formatting problem, if your point cloud is, as the name implies, an irregularly spaced collection of point...

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Combining the data
[F(1:end-1)' F(2:end)']

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Curve fitting with fails misarebly
I got a nice looking fit using <http://www.mathworks.com/help/toolbox/curvefit/cftool.html cftool> with the type of fit chosen t...

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Accuracy issues when reading data from an input file
You can't do better than that because the decimal numbers are really represented by binary numbers, which can't represent a lot ...

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make incorrect values as nan
Here is one way: I = find(diff(T)>1); T(I+1)=NaN; *EDIT*: And here is another using logical indexing: T([1 diff(T)>1]) = ...

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accessing particular parts of an array
See <http://www.mathworks.com/company/newsletters/articles/Matrix-Indexing-in-MATLAB/matrix.html;jsessionid=6NB5PLjLyRkpY76DQ0nb...

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Cell array summation
The slowdown seems to be caused by the use of cell data for indices into |ItemInfo|. Try this: Ys = sum([ItemInfo{UserDataC...

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Cutting time using optimization instead of a potentially endless for loop ?
Certainly there is, but I'm not sure quite how to formulate it with the information given. It will look something like this. Put...

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How to solve an integral?
If you get that warning from the Symbolic Math Toolbox, it may mean that there really is no symbolic solution. You could still i...

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How to save struct datatype to disk
What exactly is the problem you are having? If you just want to save the whole structure, save('name.mat',structname) will ...

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Why should I stay?
I always try to steer people asking installation questions to Mathworks Support. I'm guessing that they don't answer such quest...

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fzero problem when doing integration using quadl.
You get those error messages because |quadl| expects a function that can input a vector but |fzero| can only solve for a scalar...

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Quadrature method using vectors
One approach is the trapezoidal rule: vecsum = dot(diff(t),x(1:end-1)+x(2:end))/2; or, in loop form, vecsum = 0; for i=...

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w - value
Here is a numerical solution. First, create the file |polyDet.m| with the following code in it: function out = polyDet(x) ...

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Select the largest two numbers with their indices
Here is one approach that is efficient enough: n = 4; h=randn(n)+1i.*randn(n); h2 = sum(h.*conj(h),2); %sum of squares for ea...

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xpos(i) in Polygonal domain
You could generate random points in a rectangle enclosing the polygon and then choose the points that lie inside using <http://w...

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plot bar graph where each bar represents a range on the x axis?
I think what you're after is hist(x,xbins) where |x| is the data vector and |xbins| is a vector containing the center of eac...

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Solving for an x value using ppval
It depends - if |x| and |y| are 1-1, you can just switch them in the above two lines. In general, however, there is probably mor...

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