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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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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...

14年以上前 | 1

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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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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年以上前 | 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...

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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年以上前 | 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年以上前 | 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年以上前 | 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) ...

14年以上前 | 0

14年以上前 | 0

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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年以上前 | 0