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MATLAB in unexpected places
From the Acknowledgements section of _Spectral methods in MATLAB_ by Lloyd Nicholas Trefethen: "... there is a brass plaque ...

etwa 14 Jahre vor | 1

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Difficulty opening MATLAB file
I get the same problem, so maybe it is corrupt. You should try contacting the authors.

etwa 14 Jahre vor | 0

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Curve fitting - periodic function
You could try selecting "Sum of sin functions" for the type of fit.

etwa 14 Jahre vor | 0

Gelöst


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

etwa 14 Jahre vor

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Random sample without replacement
Here is a recursive function that will return one row of your matrix |C|: function y = randsampleWithoutReplacement(populat...

etwa 14 Jahre vor | 0

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ode15s
If you are solving something like [t,x] = solver(odefun,tspan,y0) and you want the time derivative at each point |t(i)|,...

etwa 14 Jahre vor | 0

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Is dynamic interpolation of input of function for 'quad' integration possible?
Given that your data are irregularly spaced, you may have to use interpolation after all. If your points are |(xdata,ydata)|, yo...

etwa 14 Jahre vor | 0

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ode15s
You could use <http://www.mathworks.com/help/techdoc/ref/deval.html deval>. *EDIT*: Here is a modified version of the example...

etwa 14 Jahre vor | 0

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Is dynamic interpolation of input of function for 'quad' integration possible?
Any increase in accuracy based on interpolating |a| and |b| would probably be illusory. If your points are regularly spaced, you...

etwa 14 Jahre vor | 1

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Finite-Sum Function
|S_N| is the output, but the function name is |S|. Use, e.g., S(10) (you'll need to input a number).

etwa 14 Jahre vor | 0

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fmincon not optimizing over one variable
If your function has zero derivative with respect a variable, it won't vary that variable.

etwa 14 Jahre vor | 0

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Trouble with ez-plot
The syntax of your command is wrong. This is how you do it: f = @(sig) sig.^3-.120*sig.^2-11.8*sig-(-844); ezplot(f,[-200,...

etwa 14 Jahre vor | 0

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Triple Numerical Integration with function boundaries
Here is a sketch of the approach: First, define your function to be integrated, e.g., f0 = @(x,phi1,phi2) 1./(h1(phi1,ph...

etwa 14 Jahre vor | 0

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Convert matrix into the tensor
This is not a tensor, which has a specific meaning. If you had the same number of experiments per substance, you could turn it i...

etwa 14 Jahre vor | 0

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Problem with optimization using fminunc + GradObj
You have more errors in your gradient. The correct gradient is G = [-600*x(2)*x(1)^2 + 600*x(1)^5 - 2+2*x(1) ...

etwa 14 Jahre vor | 1

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Funny situations while helping others on MATLAB Answers
I like this exchange: Q: hello, please send me the* speech database* for my project titled,"automatic speaker recognition" th...

etwa 14 Jahre vor | 1

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Question About bar plot
Yes, by splitting your bar plot into two. Here is a simple example: % First bar plot xdata = 1:9; ydata = rand(9,1); b...

etwa 14 Jahre vor | 0

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Save command: List of variables to save can vary
Here is how to do it with cell arrays: a = rand; d = rand; w=rand; condition1=logical(randi([0 1],1)); % This is just for ...

etwa 14 Jahre vor | 0

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PLOT problem
I think you are trying to do something like this: x = 1:100; c = cos(x); plot (x,c)

etwa 14 Jahre vor | 0

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Passing both the the variable name and value to a function
You can use <http://www.mathworks.com/help/techdoc/ref/inputname.html inputname> inside the function to find the names of the va...

etwa 14 Jahre vor | 2

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Converting a cell to string
Use <http://www.mathworks.com/help/techdoc/ref/char.html char>.

etwa 14 Jahre vor | 0

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Problem with optimization using fminunc + GradObj
It's a sign error. The gradient should be G = [-2 + 2*x(1) - 400*x(2)*x(1) + 400*x(1)^3 200*x(2) - 200*x(1...

etwa 14 Jahre vor | 1

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Getting better accuracy with Lsqcurvefit
The problem may be that your two parameters have such very different magnitudes, so the fit can probably not discriminate the se...

etwa 14 Jahre vor | 0

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toolbox functions do not work
It may be that you have the toolboxes installed, but don't have the license to run them. See <http://stackoverflow.com/questions...

etwa 14 Jahre vor | 0

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Is it possible to have output in an input format?
It would take a little programming. Your example could be done with disp(['var1 = [',num2str(var1),']']) but you'd need ...

etwa 14 Jahre vor | 0

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how to add a moving average filter
See <http://www.mathworks.com/help/techdoc/ref/filter.html filter>.

etwa 14 Jahre vor | 0

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What is missing from MATLAB?
An equivalent of the UNIX command |wc| that allows one to determine useful information about the size of a file before reading i...

etwa 14 Jahre vor | 1

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Problem with quad2d integration
When in doubt, just put a dot in front of all |^|'s, |*|'s and |/|'s. Also, next time you ask a question, it would help if you p...

etwa 14 Jahre vor | 1

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non-rectangular text file upload
This will do it: fid = fopen('data.csv'); tline = fgetl(fid); while ischar(tline) ind = find(tline==',',1,'first'); ...

etwa 14 Jahre vor | 1

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Time data conversion
Here are two conversions you could do: datevec('2012-01-25 16:11:10 645','yyyy-mm-dd HH:MM:SS FFF') datenum('2012-01-25 16...

etwa 14 Jahre vor | 1

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