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contourf with no isoline
Here is an example of how to do it: [C,h] = contourf(peaks(20),10); set(h,'LineColor','none')

13 years 前 | 7

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Integration problem
You can calculate integrals with limits of |-Inf| or |Inf| using <http://www.mathworks.com/help/techdoc/ref/quadgk.html quadgk>....

13 years 前 | 0

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rearranging the data in separate columns when difference of 10 is found in vectors
You could do this using a cell array: % preallocate array n = ceil(max(x)/10); y = cell(n,1); % populate it for ...

13 years 前 | 0

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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 ...

13 years 前 | 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.

13 years 前 | 0

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

13 years 前 | 0

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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...

13 years 前 | 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)|,...

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 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).

13 years 前 | 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.

13 years 前 | 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,...

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 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) ...

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 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 ...

13 years 前 | 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)

13 years 前 | 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...

13 years 前 | 2

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

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 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 ...

13 years 前 | 0

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

13 years 前 | 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...

13 years 前 | 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...

13 years 前 | 1