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match a number (date) in a matrix - Matlab
I don't think there's a completely vectorized solution, but this is close: d = datenum(bsxfun(@minus,datevec(lastDay(:,2)),[0...

14 years ago | 0

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Listing files in an arbitrarily named and deep tree
Looks like you're on a Windows system, so try: [~,flist] = system('dir *.avi /B/S') You may want to |cellstr| the result. *...

14 years ago | 0

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Numerical Integration with functions as borders
You could do this as an iterated integral using |quad| (twice). Hooray for Fubini's Theorem! Here's the volume of a hemisphere...

14 years ago | 0

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RK4 in MatLab Help!
Ahhh the classic problem. A few things I notice: # Your |vexact| is, I assume, supposed to evaluate the exact solution. In ...

14 years ago | 0

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Fitting two sets of data to one function simultaneously
I think a simple |fminsearch| might be easier in this case. You'll have to figure out how you want to define your total error t...

14 years ago | 0

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writing mfile using a mfile
You can programmatically interact with the MATLAB Editor using the API introduced in R2011a: http://blogs.mathworks.com/deskt...

14 years ago | 0

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Select matrix rows based on criteria
I can't quite work out the code (maybe the formatting is confusing me), but it sounds like what you're trying to do is this: ...

14 years ago | 0

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finding the distance between elements of a vector
OK, from what I can tell from your further input, I think this function does what you want. function d = xyspace(A,x,y) ...

14 years ago | 0

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Exponential Curve fitting
Looks a whole lot like a typical local-vs-global minimum issue. The minimum that |fminsearch| finds depends heavily on the init...

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14 years ago | 0

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How to select 2nd largest number (or largest if no 2nd largest)
Is it possible to have repeated values? If so, what do you define as the "second largest" value? Eg |secondmax([1 2 3 3]) = 2|...

14 years ago | 0

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MATLAB GUI Popup Menu
Here's an example that I think is similar to what you're trying to do. It sounds like you're using GUIDE, in which case use the...

14 years ago | 1

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finding the distance between elements of a vector
Do you know that you'll always have pairs? That is, could you ever have a vector |[0 2 0 -3 0 5 0 -2 0 0 3 0 0 0 0 2 0 -5]| or ...

14 years ago | 0

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Anonymous Function Differentiation Problem?
If you know the independent variable is called 'x': fprime = str2func(['@(x) ',char(diff(sym(regexprep(char(f),'^@\(x\)',''...

14 years ago | 1

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Graphing a linear regression line from given points, very simple example, having trouble with matrices dimensions?
% Enter t=dataC and y=dataABS as columnwise vectors And then you enter them as rows :) Stick a transpose ( |'| ) on those th...

14 years ago | 0

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Solutions using ODE with different initial conditions
As well as Walter's solution, you can also simply specify fixed timesteps for |ode45| to use: tvals = % make a vector of ti...

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very basic matlab question about .dat file
The statement of the problem seems ill-formed to me. How are these variables being "measured"? I could see reading in *from* a f...

14 years ago | 0

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how to halt the program?
ctrl-C?

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Store as array not variable
The classic trap! c1 = b^2*(((exp(a*2*pi)-cosh(a*b*T0))/sinh(a*b*T0))^2-1); The divide there will be interpreted as a ma...

14 years ago | 0

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simple quastion about randn and mean of random noise
|n = randn(1000,1)| creates a *vector* (1000-by-1), so |sum(n)| is the sum of the thousand random numbers. Taking the mean is t...

14 years ago | 0

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Minimization of function. Plz Help.
R = [1 2 3;4 5 6;7 8 9]; [row,cols] = size(R); f = ones(1,cols); fobj = @(x) growth(R,x); opts = optimset('A...

14 years ago | 0

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fminsearch with output constraint
But by definition |fminsearch| is an unconstrained method, so you can't provide a constraint. If there's some reason you can't ...

14 years ago | 0

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Stock time interval conversion
Do you want to index or do you want to interpolate? Given that you don't necessarily have data for the values you want (every f...

14 years ago | 0

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Appending to a saved dataset
If it just comes down to "I'd like to be able to append to the exported dataset instead", then here's one way to do it, but it's...

14 years ago | 0

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??? Error using ==> mldivide Matrix dimensions must agree.
Unless you actually want to do a matrix division, a simple solution is to do a find-n-replace: "/" -> "./" Otherwise, please ...

14 years ago | 0

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Is there a reason MuPad doesn't find the obvious cancellation?
I'm guessing it's something to do with assumptions about squares and square roots, and maybe denominators. Wouldn't swear to it...

14 years ago | 1

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Black pixels to white
x = imread('street1.jpg'); figure image(x) idx = all(x==0,3); x(repmat(idx,[1,1,3]))=255; figure image(x) ...

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Finding 2 independent input variables that provides mimimum of a function
Given that |blackbox| is a function of two variables, why not do some visualization to see what it looks like? x = linspace...

14 years ago | 0