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How to solve these mathematical equations simultaneously?
Hello Luqman Assuming N and n are set beforehand, there are four equations & five unknowns, so one of the unknowns gets to be...

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Strange scaling issue with derivative implementation
Hi Nimrod, probably a bit late for an answer, especially one that doesn't really change anything. I believe that your code i...

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Calculate elements in matrices
Hi Pei, To do multiply and divide operations element-by-element, put a dot in front of the mult or divide symbol. In this ca...

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for loop ode 45 changing parameter values
Hi gorilla3, Here is the simplest possible example of what ode45 is doing, that also inputs an extra parameter. To find th...

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E-plane and H-plane patterns of a rectangular microstrip patch
Hi Maximiliano, Before getting to the plot, there are a couple of things in the code that need to be changed. [1] In the mul...

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change bar color based on value
Hi Morgan, Unless you are trying to make a movie*, it's faster and more Matlablike to create A and B all at at once: N =...

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Finding the root of a function
Hi Lilach, After moving the syms x statement to the top so that the code runs, it is not so clear that it is going to get the...

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Getting an error : In an assignment A(:) = B, the number of elements in A and B must be the same.
Hi Arun, Have you checked the value of RBF? I think it's quite likely that since you have supplied the value of 'a', you are...

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Square wave function Mean Squared Error differing by a factor of 2?
Hi Jeff, It depends on how you want to look at it. For the entire square wave there are overshoots at the four locations bel...

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Can a controllable matrix become uncontrollable due to matrix transformations?
Hello Z, You don't say what kind of transformations you have in mind. but generally det(B*A) = det(B)*det(A) det(...

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How to speed up code with ppval and integral
Hi Martin, Here's some code to integrate a piecewise polynomial on the basis of its polynomial coefficients, no actual numeri...

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GIBBS phenomenon & sum of squared differences
Hi Jeff, No, it's not really about the zeroth order coefficient. At a discontinuity, a fourier series converges at value hal...

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Jacobi iteration code, not producing correct solution
Hi Arindam, Just before the while loop you need to reverse the two statements to make it x0=x; x=J*x+c; With the ord...

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Ask for creating new matrix from Odd-Indexed and Even-Indexed Elements
Hi Phat, you're close C = zeros(742,2); C(1:2:end,:) = A; C(2:2:end,:) = B;

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symmetric vs asymmetric Fourier series
Hi Jeff, Yes it's a bad idea, assuming that a Friedlander fourier series is just a particular way of obtaining the usual fourie...

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Normalisation of FFT not consistent.
Good question. I didn't take a course in DSP, so I don't have a textbook recommendation from experience. Rodriguez mentions th...

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How can I normalize a function solved numerically?
Hi david, A normalization integral that small shows that the scaling could be improved upon, but as a workaround is this what...

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How to standardize unstandardized beta coefficients
Hi Nuchto You forgot that you need to regress against the same y, otherwise it's apples and oranges. So the second regressio...

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Getting multiple roots of a function with infinite roots
Hi Sentient6, Here is a way that does them all in one go using Newton's method. It's good for either sign of C. x*tanx is a...

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Why am I unable to determine the number of iterations it takes to determine the solution vector? My number of iterations keeps equaling the maxIter
Hi Benjamin, In the third line of the Jacobian, try replacing 0, 0, (4*((5.67*10^-8)*(Tc^3)))+1.865, -1 with the corr...

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How do I find the impulse response function
Hi Jaques, I believe the problem is that you have a couple of small errors in the 'a' vector (they don't agree with the origi...

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Balance root-mean-square in audio clips
Hi Tahariet, You would like to normalize R and L so that the *sum* of R power and L power does not change from clip to clip. ...

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Array multiplication along certain dimension?
Hi Visa, This seems to work A1 = 2; A2 = 3; A3 = 4; N = 7; A = rand(A1, A2, A3, N); V = rand(1, N); ...

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interpolating curve with tangent ends
Hi Michal, depending on the data, the spline function could give good results. see help spline, where it says that if Y cont...

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Why does the following simple Harmonic oscillator (without damping) behave as a damped harmonic oscillator?
Hi Sameer, I believe this is a standard numerical accuracy issue. Here is some shortened code that is basically the same as ...

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Radiation pattern plotting.
Hi Yuval, I made a stylistic change to your code and defined theta at the very start with the factor of pi, rather than waiti...

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How do I only save my solution every x iterations in a for loop?
Hello J, If **numberoftimesIwantorecord** does not exactly divide **maxitimestep**, then there are two problems with this app...

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How can I find a intersection of four ponits?
Hello Yoon, lots of possible expressions for this. Here is one that is pretty symmetric in the points. Let a = [x(n),y(n...

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integral function doesn't work well！
Hi Joe, this is interesting and probably worth a second question on this website for the following reason. Here is a function ...

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How to symbolically calculate the curl of a vector
Hi Max, this appears to work. >> minusdBdt = curl([E1,E2,E3],[x,y,z]) minusdBdt(x, y, z) = diff(E3(x, y, z), ...

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