Risposto

Dot product of two vector

Hello Syazana syms c1 s1 n1 n2 n3 a1 a2 a3 real A = [c1 -s1 0; s1 c1 0; 0 0 1] A = [c1, -s1, 0] [s1, c1,...

Dot product of two vector

Hello Syazana syms c1 s1 n1 n2 n3 a1 a2 a3 real A = [c1 -s1 0; s1 c1 0; 0 0 1] A = [c1, -s1, 0] [s1, c1,...

6 mesi fa | 0

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Risposto

Solve the integral in the point where the function is singular

Hi Dimani, Leaving out the first '1 ' term that has no singularity and leaving off some constants, you are basically looking at...

Solve the integral in the point where the function is singular

Hi Dimani, Leaving out the first '1 ' term that has no singularity and leaving off some constants, you are basically looking at...

6 mesi fa | 0

Risposto

How to generate a noise which sums up as zero?

Hi Ananta, noise=randn(1,64)*sqrt(0.001)*240 noise = noise - mean(noise); if you subtract off the mean, then the new sum of t...

How to generate a noise which sums up as zero?

Hi Ananta, noise=randn(1,64)*sqrt(0.001)*240 noise = noise - mean(noise); if you subtract off the mean, then the new sum of t...

7 mesi fa | 0

Risposto

Trying to use modified secant method to solve for a theta over different g values.

Hi Carson, let b = g*d^2/(2*v^2) % a distance then your equation (multiplied by -1) is b/cos^2 - d*tan - y = 0 plug in ...

Trying to use modified secant method to solve for a theta over different g values.

Hi Carson, let b = g*d^2/(2*v^2) % a distance then your equation (multiplied by -1) is b/cos^2 - d*tan - y = 0 plug in ...

7 mesi fa | 0

Risposto

I require frequency response from transfer function = 1/(s^2+(b/m)*s+k/m) where b= 0.0011, k= 87.88 , m = 0.99 in matlab and i need freq in khz

Hi sia, there is not much need to do any detailed calculation when your starting point is what it is. This system has a small a...

I require frequency response from transfer function = 1/(s^2+(b/m)*s+k/m) where b= 0.0011, k= 87.88 , m = 0.99 in matlab and i need freq in khz

Hi sia, there is not much need to do any detailed calculation when your starting point is what it is. This system has a small a...

7 mesi fa | 0

Risposto

Difference between 2 orientations

Hello Jonathan, You have two 3x3 rotation matrices, each expressed in terms of euler angles, Rrpha(:,1:3) = [cp.*ch, -sp, cp...

Difference between 2 orientations

Hello Jonathan, You have two 3x3 rotation matrices, each expressed in terms of euler angles, Rrpha(:,1:3) = [cp.*ch, -sp, cp...

8 mesi fa | 0

Risposto

Can't tell if exprnd is working correctly

Hi Umberto, I believe the issue happens because you are plotting the cumulative variables D1 and D2. Once the difference D1-D2...

Can't tell if exprnd is working correctly

Hi Umberto, I believe the issue happens because you are plotting the cumulative variables D1 and D2. Once the difference D1-D2...

8 mesi fa | 0

Risposto

Raising a large sparse matrix to a large power

Hi if you are operating on 'a particular vector' v then you do not have to iterate as in m = m*m % iterate to form ...

Raising a large sparse matrix to a large power

Hi if you are operating on 'a particular vector' v then you do not have to iterate as in m = m*m % iterate to form ...

8 mesi fa | 2

Risposto

I’m thinking of make a command to change Hankel matrix into x time series

Hi Ahmed, here is one way y = magic(5) n = size(y,2); x = zeros(1,2*n-1); x(1:2:end) = diag(y).'; x(2:2:end) = diag(y,1)...

I’m thinking of make a command to change Hankel matrix into x time series

Hi Ahmed, here is one way y = magic(5) n = size(y,2); x = zeros(1,2*n-1); x(1:2:end) = diag(y).'; x(2:2:end) = diag(y,1)...

8 mesi fa | 0

Risposto

How to find the width of a peak where there is no actual data, just individual points?

Hi Alfredo, Usually your ydata would be the frequency domain version of a linear quantity such as voltage or displacement. Hal...

How to find the width of a peak where there is no actual data, just individual points?

Hi Alfredo, Usually your ydata would be the frequency domain version of a linear quantity such as voltage or displacement. Hal...

8 mesi fa | 1

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Risposto

why the simulation period is wrong about schrodinger equation in a harmonic potential

Hi Daniel, Nice animation. Looks like in your 'hamiltonian' function, the kinetic energy is missing a factor of 1/2. Changing...

why the simulation period is wrong about schrodinger equation in a harmonic potential

Hi Daniel, Nice animation. Looks like in your 'hamiltonian' function, the kinetic energy is missing a factor of 1/2. Changing...

8 mesi fa | 0

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Risposto

Units for Thermal PDE thermalProperties Function

Hi Simon, The heat conduction equation is dT/dt = alpha (d^2/dx^2+d^2/dy^2+d^2/dz^2) T where alpha, the thermal diffusivity, ...

Units for Thermal PDE thermalProperties Function

Hi Simon, The heat conduction equation is dT/dt = alpha (d^2/dx^2+d^2/dy^2+d^2/dz^2) T where alpha, the thermal diffusivity, ...

8 mesi fa | 0

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Risposto

solve 4 equations with some unknown coefficients.

Hi Ahmad, If the answers don't have to match up with the paper, that makes things easier. I took four equations very similar t...

solve 4 equations with some unknown coefficients.

Hi Ahmad, If the answers don't have to match up with the paper, that makes things easier. I took four equations very similar t...

8 mesi fa | 0

Risposto

looking for convenient way to extract matrix from 1*n*n

Hi YL, A=zeros(5,5,5) B=squeeze(sum(A,1)); Squeeze removes all singleton dimensions.

looking for convenient way to extract matrix from 1*n*n

Hi YL, A=zeros(5,5,5) B=squeeze(sum(A,1)); Squeeze removes all singleton dimensions.

9 mesi fa | 0

Risposto

xcorr lag input to time?

Hi Carly, lags is a dimensionless index, so it's in samples (it has to be samples since xcorr has no way of knowing what fs mig...

xcorr lag input to time?

Hi Carly, lags is a dimensionless index, so it's in samples (it has to be samples since xcorr has no way of knowing what fs mig...

9 mesi fa | 0

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Risposto

Most efficient way to put vector on the off-diagonal of the blocks of a block matrix

Hi David, MODIFIED see Dyuman's comment to sensibly shorten this original code. n = 4; v = [1 2 3 4 5 6 7 8 9 8 7 6]; % le...

Most efficient way to put vector on the off-diagonal of the blocks of a block matrix

Hi David, MODIFIED see Dyuman's comment to sensibly shorten this original code. n = 4; v = [1 2 3 4 5 6 7 8 9 8 7 6]; % le...

9 mesi fa | 1

Risposto

How can I create a random matrix without repeating any value between column

Hello Wan, all columns contain 1 through 4, and all columns are different a = perms(1:4) % all 24 permutations of 1:4 ...

How can I create a random matrix without repeating any value between column

Hello Wan, all columns contain 1 through 4, and all columns are different a = perms(1:4) % all 24 permutations of 1:4 ...

9 mesi fa | 1

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Risposto

recreating roots of a derivative of bessel funtion of first order

Hi fv, Here is a function for the first q zeros of both Jn(x) and dJn(x) /dx. As an example, to find the first 100 zeros of th...

recreating roots of a derivative of bessel funtion of first order

Hi fv, Here is a function for the first q zeros of both Jn(x) and dJn(x) /dx. As an example, to find the first 100 zeros of th...

9 mesi fa | 1

Risposto

Picking Branch Cut of Square Root

Hi bil, Here is a function that does that job. It appears that you want to do the division (a-i)/(a+i) before taking the squar...

Picking Branch Cut of Square Root

Hi bil, Here is a function that does that job. It appears that you want to do the division (a-i)/(a+i) before taking the squar...

9 mesi fa | 2

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Risposto

Find the nonzero maximum frequency corresponding to FFT graph.

Hi Zahra, the peak at zero frequency is because your signal does not have average value of zero, but has a DC offset. To elimi...

Find the nonzero maximum frequency corresponding to FFT graph.

Hi Zahra, the peak at zero frequency is because your signal does not have average value of zero, but has a DC offset. To elimi...

10 mesi fa | 0

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Risposto

Find combination of 12 matrix rows, fulfilling certain criterion, from matrix of size 3432 *7

Hi Ernesto, Once you have a single 12x7 solution you can make many more by random element swapping of elements in that matrix. ...

Find combination of 12 matrix rows, fulfilling certain criterion, from matrix of size 3432 *7

Hi Ernesto, Once you have a single 12x7 solution you can make many more by random element swapping of elements in that matrix. ...

10 mesi fa | 0

Risposto

I know it is a redundant question, but i have no idea why solve keeps returning 0

Hello Andrei, First of all, all these expressions are functions of (x1-x2) and (y1-y2) only. That means if x1,x2,y1,y2 is a so...

I know it is a redundant question, but i have no idea why solve keeps returning 0

Hello Andrei, First of all, all these expressions are functions of (x1-x2) and (y1-y2) only. That means if x1,x2,y1,y2 is a so...

10 mesi fa | 2

Risposto

atanh of negative complex numbers

Hi Derek, For the troublesome subplot, try semilogx(f,unwrap(imag(2*x*gamma))/(2*x)) The idea is that the phase is proportion...

atanh of negative complex numbers

Hi Derek, For the troublesome subplot, try semilogx(f,unwrap(imag(2*x*gamma))/(2*x)) The idea is that the phase is proportion...

11 mesi fa | 0

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Risposto

Solving systems of trig equations

Hi Jon, Here is one method. To come up with values of r and g that work, it appears to be easier to think in terms of R = r^2 ...

Solving systems of trig equations

Hi Jon, Here is one method. To come up with values of r and g that work, it appears to be easier to think in terms of R = r^2 ...

11 mesi fa | 1

Risposto

Change the period/frequency of a Van der Pol Oscillator

Hi Alexis, If you want to preserve the shape you will have to have a larger set of parameters. I am taking as given your equa...

Change the period/frequency of a Van der Pol Oscillator

Hi Alexis, If you want to preserve the shape you will have to have a larger set of parameters. I am taking as given your equa...

11 mesi fa | 0

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Risposto

Cconditional subtraction of 2 vectors of different lengths

Hi salah, You can do quite a bit if the two vectors are sorted. Assume you have two sorted vectors sx and sy of length Nx and ...

Cconditional subtraction of 2 vectors of different lengths

Hi salah, You can do quite a bit if the two vectors are sorted. Assume you have two sorted vectors sx and sy of length Nx and ...

12 mesi fa | 0

Risposto

Get "Matrix is is singular to working precision" when attempting a global stiffness matrix with four nodes

Hi Declan, I am not sure how you are getting the error message. Running the code with k changed to K d(range) = K(range,range...

Get "Matrix is is singular to working precision" when attempting a global stiffness matrix with four nodes

Hi Declan, I am not sure how you are getting the error message. Running the code with k changed to K d(range) = K(range,range...

circa un anno fa | 1

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Risposto

energy signal

Hi k.v. For a given real signal y(n) of length N, n = 1 to N, the power at any point n is y(n)^2, the average power P is Pave ...

energy signal

Hi k.v. For a given real signal y(n) of length N, n = 1 to N, the power at any point n is y(n)^2, the average power P is Pave ...

circa un anno fa | 0

Risposto

How can I evaluate a complex definite integral?

Hi Valentin, It's not strictly necessary (see Paul's vpa solution) but it is advantageous to scale things properly before doing...

How can I evaluate a complex definite integral?

Hi Valentin, It's not strictly necessary (see Paul's vpa solution) but it is advantageous to scale things properly before doing...

circa un anno fa | 0

Risposto

How to use sinc function

Hi Ricardo, while it might be nice to have the Signal Processing toolbox, you certainly don't need to buy any toolboxes to do t...

How to use sinc function

Hi Ricardo, while it might be nice to have the Signal Processing toolbox, you certainly don't need to buy any toolboxes to do t...

oltre un anno fa | 0

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