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Answered
Imaginary output from arccosine function when the input is close to -1
Hi Ali, The acos and (m dot n) approach is not a good way to go about this at all. It's inaccurate when n is almost equal to -m...
Imaginary output from arccosine function when the input is close to -1
Hi Ali, The acos and (m dot n) approach is not a good way to go about this at all. It's inaccurate when n is almost equal to -m...
9 days ago | 1
Answered
Sign of lambda.eqlin
Hi Aiden, William's example is f(x) = x^2+y^2 Aeq=[1,1] beq = 1 L(x,lambda) = f(x) + lambda*(Aeq*x'-beq) % conve...
Sign of lambda.eqlin
Hi Aiden, William's example is f(x) = x^2+y^2 Aeq=[1,1] beq = 1 L(x,lambda) = f(x) + lambda*(Aeq*x'-beq) % conve...
10 days ago | 1
Answered
ilaplace doesn't handle tanh()
Hi marcel, There seems to be some uncertainty about the question, but this answer is for the voltage across the resistor, for a...
ilaplace doesn't handle tanh()
Hi marcel, There seems to be some uncertainty about the question, but this answer is for the voltage across the resistor, for a...
1 month ago | 0
Question
Iterating the eigenvalue function (eig) produces patterns --- is this a well known result?
Suppose M is a square matrix and [N lambda] = eig(M), so that the columns of N contain the eigenvectors of M and the diagonal ...
2 months ago | 2 answers | 0
2
answersAnswered
Transpose matrix and your transposition
HI Airto, Rather than actually transpose it with the ' (apostrophe) command, you can use zeros(3,3500000); The transpose a...
Transpose matrix and your transposition
HI Airto, Rather than actually transpose it with the ' (apostrophe) command, you can use zeros(3,3500000); The transpose a...
2 months ago | 1
| accepted
Answered
How to model a cable passing through a hole in 3D in Simscape?
Hi Soumya, (hypothetical answer since I don't know how details work in Simscape). In your diagram if it's known that the exit ...
How to model a cable passing through a hole in 3D in Simscape?
Hi Soumya, (hypothetical answer since I don't know how details work in Simscape). In your diagram if it's known that the exit ...
2 months ago | 0
Answered
How to correctly find the solution of a system of equations containing trigonometric functions
Hello yan, This is one of those situations where a multivariable solver is best avoided if possible. With enough variable subs...
How to correctly find the solution of a system of equations containing trigonometric functions
Hello yan, This is one of those situations where a multivariable solver is best avoided if possible. With enough variable subs...
3 months ago | 0
Answered
can anyone suggest me how to convert binary value to gray code value??
Here I used 'grey' instead of gray since Matlab has a function called gray. n = 4 G = grey(n); IG = igrey(n); nbin = dec2bin...
can anyone suggest me how to convert binary value to gray code value??
Here I used 'grey' instead of gray since Matlab has a function called gray. n = 4 G = grey(n); IG = igrey(n); nbin = dec2bin...
3 months ago | 0
Answered
How to further utilize the "simplify" function for simplification?
How did an overall factor of theta_dot5 in the question later become sin(theta_5) in the comments ?!? Taking the original posti...
How to further utilize the "simplify" function for simplification?
How did an overall factor of theta_dot5 in the question later become sin(theta_5) in the comments ?!? Taking the original posti...
3 months ago | 0
| accepted
Answered
How can I get the correct answer for int(1/x) with symbolic integration?
Hello Georg, I agree that log(|x|) is the correct way to do this, consistent with what tables of integrals have to say. (With ...
How can I get the correct answer for int(1/x) with symbolic integration?
Hello Georg, I agree that log(|x|) is the correct way to do this, consistent with what tables of integrals have to say. (With ...
4 months ago | 0
| accepted
Answered
How does sub2ind work with non-integer values?
Hi Saygin, Interesting behavior. The help for sub2ind says it 'returns the linear index equivalent' and I guess they really me...
How does sub2ind work with non-integer values?
Hi Saygin, Interesting behavior. The help for sub2ind says it 'returns the linear index equivalent' and I guess they really me...
4 months ago | 3
Answered
Spectrum block shows incorrect dbm value
Hi Sergei, The plot shows peaks at both positive and negative frequencies. Each of those equal size peaks contains half of the...
Spectrum block shows incorrect dbm value
Hi Sergei, The plot shows peaks at both positive and negative frequencies. Each of those equal size peaks contains half of the...
4 months ago | 1
| accepted
Answered
Positive Roots of bessel functions.
Hi Javeria, here is a function besse0j to calculate the roots of J and J'. (at the origin, Jn(0) = 0 for n>0 but these zeros ar...
Positive Roots of bessel functions.
Hi Javeria, here is a function besse0j to calculate the roots of J and J'. (at the origin, Jn(0) = 0 for n>0 but these zeros ar...
5 months ago | 0
Answered
Can we find derivative of bessel functions in matlab directly?
Hi Javeria, Here is a function that produces J'm(x) for integer m. function y = besseljd(n,x,opt) % derivative of bessel fu...
Can we find derivative of bessel functions in matlab directly?
Hi Javeria, Here is a function that produces J'm(x) for integer m. function y = besseljd(n,x,opt) % derivative of bessel fu...
5 months ago | 0
Answered
solving system of equations
Hi Javeria, If it's not required to solve this in the way you mention, there is a better way. Assume that x2 is positive or ze...
solving system of equations
Hi Javeria, If it's not required to solve this in the way you mention, there is a better way. Assume that x2 is positive or ze...
5 months ago | 0
Answered
Why am I only getting the upper sideband when multiplying complex signals?
Hi Jared, You probably can't reproduce the result with a single operation. When you use the 'complex' option, the resulting wa...
Why am I only getting the upper sideband when multiplying complex signals?
Hi Jared, You probably can't reproduce the result with a single operation. When you use the 'complex' option, the resulting wa...
5 months ago | 0
Answered
The coefficients of a Hermite polynomial
Hi Magdy, For a change of pace, here is a function that calculates the coefficents of Hn by recursion. I didn't want to get in...
The coefficients of a Hermite polynomial
Hi Magdy, For a change of pace, here is a function that calculates the coefficents of Hn by recursion. I didn't want to get in...
5 months ago | 0
Answered
why mod(rref(A), 2) does not give the correct result?
Hi Lily, Although c is a linear combination of a and b mod 2, rref does not know anything about mod 2. rank([a b c]) ans = ...
why mod(rref(A), 2) does not give the correct result?
Hi Lily, Although c is a linear combination of a and b mod 2, rref does not know anything about mod 2. rank([a b c]) ans = ...
6 months ago | 0
| accepted
Answered
how to determine the wavelengths of an fft of a non-dimensional sequence
Hi Andreas, For a fourier transform, time and frequency, or length and wave number, or [before-fourier-transform] independent v...
how to determine the wavelengths of an fft of a non-dimensional sequence
Hi Andreas, For a fourier transform, time and frequency, or length and wave number, or [before-fourier-transform] independent v...
7 months ago | 1
Answered
Can I get the integral formula using Matlab?
Hello Haya, The integral is very much defined for m=n. In that case you are integrating the function sin(n*x/2)^2*(x-pi)^2 w...
Can I get the integral formula using Matlab?
Hello Haya, The integral is very much defined for m=n. In that case you are integrating the function sin(n*x/2)^2*(x-pi)^2 w...
7 months ago | 0
Answered
Is there any expert who knows how the SNR result in the RF Budget Analyzer is calculated? Why is it inconsistent with the value I calculated?
Hi ZW, It's good to work out things independently as you are doing. The available power is 0 dBm, i.e. 1 milliwatt = -30 dB wa...
Is there any expert who knows how the SNR result in the RF Budget Analyzer is calculated? Why is it inconsistent with the value I calculated?
Hi ZW, It's good to work out things independently as you are doing. The available power is 0 dBm, i.e. 1 milliwatt = -30 dB wa...
7 months ago | 1
| accepted
Answered
Peak in probability distribution moves in normpdf when changing lower bound for input vector
Hi Chris, try x = 10e3:70e3; plot(x,normpdf(x,40e3,6e3)) The problem occurs because if you create y = f(x) and use plot(y), t...
Peak in probability distribution moves in normpdf when changing lower bound for input vector
Hi Chris, try x = 10e3:70e3; plot(x,normpdf(x,40e3,6e3)) The problem occurs because if you create y = f(x) and use plot(y), t...
7 months ago | 2
| accepted
Answered
Regarding grid generation using finite difference method (*code fixed)
Hello arxiv, It appears that what you want in the code is not new_x = x(n, m) + Delta_eta * ((pi/4) - y_xi)/(x_xi); but rath...
Regarding grid generation using finite difference method (*code fixed)
Hello arxiv, It appears that what you want in the code is not new_x = x(n, m) + Delta_eta * ((pi/4) - y_xi)/(x_xi); but rath...
8 months ago | 1
| accepted
Answered
solve Lagrange eqs.
Hi Lorenzo, The sin(phi) factor in the denominator does not really matter, in the sense that if phi can be zero, then the parti...
solve Lagrange eqs.
Hi Lorenzo, The sin(phi) factor in the denominator does not really matter, in the sense that if phi can be zero, then the parti...
8 months ago | 0
Answered
How to remove a mirror tilt
Suppose the two mirrors, the source and the detector are as shown below. Assume the beam splitter does not have a wedge effect...
How to remove a mirror tilt
Suppose the two mirrors, the source and the detector are as shown below. Assume the beam splitter does not have a wedge effect...
8 months ago | 1
Answered
Remove ignored complex values from a plot
Hi Arne, Either you are getting complex numbers because of an error in the algebra that you coded up (I assume you have checked...
Remove ignored complex values from a plot
Hi Arne, Either you are getting complex numbers because of an error in the algebra that you coded up (I assume you have checked...
8 months ago | 0
Answered
bessel funtion drawing problem part two
Hello Zeyuan, You are using the expression Y(nu,z) = (J(nu,z)*cos(nu*pi) - J(-nu,z))/sin(nu(z)) which does not work when nu i...
bessel funtion drawing problem part two
Hello Zeyuan, You are using the expression Y(nu,z) = (J(nu,z)*cos(nu*pi) - J(-nu,z))/sin(nu(z)) which does not work when nu i...
8 months ago | 0
Answered
trouver un angle avec l'equation de trajectoire d'un projectile
The syms solutions are getting out of hand, which is not all that unusual. The kinematic equations evidently are for a projecti...
trouver un angle avec l'equation de trajectoire d'un projectile
The syms solutions are getting out of hand, which is not all that unusual. The kinematic equations evidently are for a projecti...
8 months ago | 0
Answered
Plotting inverse Laplace transform
Hi SA Speculative answer: I don't believe that the function F is a likely candidate for a Laplace transform. What you have is...
Plotting inverse Laplace transform
Hi SA Speculative answer: I don't believe that the function F is a likely candidate for a Laplace transform. What you have is...
8 months ago | 0
| accepted
Answered
Looking for linear system Ax=0 precision improvements
Hi vanni, My comment of March 4 discussed relative error calculations in solving for x in A*x = 0. (Some boring details are me...
Looking for linear system Ax=0 precision improvements
Hi vanni, My comment of March 4 discussed relative error calculations in solving for x in A*x = 0. (Some boring details are me...
9 months ago | 1
