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Recursive loops in MATLAB
Hi Ricardo, here is a method using a function I created recently that is related to the adjustable-dimension issue. This is th...

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fsolve Finite difference - Problem: "indices must either be real positive integers or logicals"
Hi Max, You did not mention where in the code the error occurred, but certainly you will get such an error with for j=1:N-...

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Problem with multiple values on plot
Hello Catherine, The last line will probably work if changed to text(L_val,L_pks,num2str(L_val'),'fontsize',12); this i...

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error when using min function
Hi Andrew, this is a hypothetical answer but it may be that you have, somewhere else, defined 'min' to be a variable .e.g min ...

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I want to find common values in two arrays(For example if A=[1 2 3 4 5 6] and B=[9 8 7 6 3 1 2] the result is ans=[1 2 3 6]).Is there any method without using loop?
Hello Muhammed, take a look at the 'intersect' function

más de 9 años hace | 1

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Is there a simpler way to produce an rgb image from a grayscale matrix based on custom thresholds?
Hello Andrew, Red = zeros(size(B)); Green = zeros(size(B)); Blue = zeros(size(B)); Red(B<=120) = 255; Blue(...

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3D interpolation question
Hello S, You are close on this. Right now you are making a finer 81x81 matrix and looking at its 1,1 element, which is off in ...

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Using MATLAB i want to find a polynomial q(s) such that s5 + 7s4 + 20s3 + 30s2 +24s + 8 = p(s)q(s) . where as p(s) = s3 + 3s2 + 4s + 2.
Hi Husain, go to 'help deconv' and take a look at that function, keeping in mind that in Matlab a vector of polynomial coeffici...

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inverse power method for smallest eigenvector calculation
Hello Turker, There is nothing wrong here. The eigenvalue equation is A*v = lambda*v and so for the eigenvector, both ...

más de 9 años hace | 1

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Duration & Calendar Duration. What is the difference?
Hello vc, Calyears and years are two different quantities. Calyears add a year, taking into account leap years, and gives th...

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How does if(0) work within a function?
Hello Padma, if(0) always comes up false, so the operations after the 'else' statement will always be performed. It's a low-re...

más de 9 años hace | 3

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Please help, the value of a function is changing with the domain.
Hello Joshua, For each variable, try this with extra dots in the locations shown. This is because it appears that you want ter...

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Normalization of the eigenvectors in eig(A) vs. eig(A,eye(length(A)); Orthonormality relationship
Hello Jerome, It's an interesting question why Mathworks chose not to normalize the column vectors in V2 and W2 when they did s...

más de 9 años hace | 0

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define associated legendre by hypergeometric functions
Hi Kurt, Probably the easiest thing to do is look up associated legendre polynomials on wikipedia, where they provide the expre...

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FFT in dB scale
hi Alexander I assume you are looking for a couple of peaks at -6 dB. Otherwise this answer will not be of help. But to get -...

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Plotting plane through point arrays midpoint
Hi Chaosante, The basic problem here is that the equation for the plane is (in free notation) [(x,y,z)-(xmean,ymean,zmean)...

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How the implement a 3-fold sum?
Hello Stephen, Here is one way, although you do make three arrays of the same size as M: [xx yy zz] = ndgrid(x,y,z); S ...

más de 9 años hace | 0

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How can I solve y''+yy'=0, y(0)=1, y'(0)=-1 in matlab?
Hello Grace, y = -tan(x/2 - pi/4)

más de 9 años hace | 0

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Show that a larger number is bigger than another large number
Hello Delia, If what you need to know is which is larger, then John has certainly addressed that. However, I was thinking that ...

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Definite integral with complex number
Hello Diana, symbolic variables are a great thing, but if you are looking for a numerical result and are happy with 15 or so si...

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Energy calculated from an image doesn't match with the energy calculated from its Fourier transform
Hello IPN, I assume you mean sum(sum(...)) rather than sum(...). It appears that you are assuming a constant of proportionality...

más de 9 años hace | 0

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Polyfit on semilogy. Straight line equations and intercept point
Hello Emanuele, when you are looking at a semilogy plot you are interested in log(y) vs. x. So you need to go into log-land an...

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How can I test if a number is irrational?
Hello Alexandre, although your interest is along conceptual lines, still it's fun to look at practical consequences. Supposing...

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How do I make this 2 dimensional vector follow a formula
Hello Jesse, The standard way to do this is with the meshgrid function: x = 1:10; % or whatever size it is y = 1:10...

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frequency domain linear regression
Hi Jan, You are correct that k is the index corresponding to frequency. In an fft, k = 6 always corresponds to 6 oscillations ...

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Integral gives wrong answer
Hello Frank, This might be more of an observation than an answer, but one point not in your favor is that since log10(x) = log(...

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I want to convert the output of transient analysis of cantilever beam from time domain to frequency domain, so i used the fft function as below. But i am not getting the correct answer. Please anyone can help me to solve this problem
Hi Siddesha, please format your code by highlighting it, using the {}Code button and using ENTER if necessary to make individual...

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Issue plotting maximum and minimum roots of polynomial
Hi Peter, I believe that the basic problem here is the three lines of code T(i) = 63.2 + i; Tre = T(i)/Tc; f = A...

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How to convert the x an y axis to frequency in plotting 2D FFT?
Hi Poorva, If what you are ffting is truly a 2d time array, then there will be a sampling frequency for each direction. In tha...

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Why are the peaks of my spectrum not exactly at the frequencies of my sinusoidal input signal?
Hi Luc, I don't believe that the fft or ifft is necessarily inaccurate just because it is discrete or has finite boundaries. Y...

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