Answered

Intersection of Discretized Curves

It would help to have the data. TThe approach to these problems is straightforward. In this instance, the independent variab...

Intersection of Discretized Curves

It would help to have the data. TThe approach to these problems is straightforward. In this instance, the independent variab...

ungefär en månad ago | 0

| accepted

Answered

Lowpass vs bandpass filtering

The functions may by default design a FIR filter, and FIR filters have problems with some signals, since the FIR filter order ma...

Lowpass vs bandpass filtering

The functions may by default design a FIR filter, and FIR filters have problems with some signals, since the FIR filter order ma...

ungefär en månad ago | 0

Answered

Plotting error bars on curve

I really can’t do anything without the data. The rest of the code (that imports the data and processes it including calculating...

Plotting error bars on curve

I really can’t do anything without the data. The rest of the code (that imports the data and processes it including calculating...

ungefär en månad ago | 0

| accepted

Answered

3D Figure from Excel (x,y,z)

It always helps to have your data. A picture may be worth a thousand words, however on MATLAB Answers, data is worth a thousand...

3D Figure from Excel (x,y,z)

It always helps to have your data. A picture may be worth a thousand words, however on MATLAB Answers, data is worth a thousand...

ungefär en månad ago | 0

| accepted

Answered

MATLAB FFT bin size

I agree with @Steven Lord, however there are ways to do what you want with the MATLAB fft function. I wrote a small utility fun...

MATLAB FFT bin size

I agree with @Steven Lord, however there are ways to do what you want with the MATLAB fft function. I wrote a small utility fun...

ungefär en månad ago | 1

| accepted

Answered

I would like to plot an interpolated 3d Surface between two faces, i.e. the third face of a truncated cone. my plot isn't working but I'm not sure what is wrong

TThis does not look like a cone to me at all. What do you want to do? r1=0.5; % t1=[(0:0.1:2*pi),0]; t1=0:0.1:2*pi; X1=...

I would like to plot an interpolated 3d Surface between two faces, i.e. the third face of a truncated cone. my plot isn't working but I'm not sure what is wrong

TThis does not look like a cone to me at all. What do you want to do? r1=0.5; % t1=[(0:0.1:2*pi),0]; t1=0:0.1:2*pi; X1=...

ungefär en månad ago | 0

| accepted

Answered

Strange issue with mean, max, and min of vector?

See the plotted values — load('diffT.mat') whos('-file','diffT') % diffT neg_vals = nnz(diffT < 0) [lo,hi] = bounds(d...

Strange issue with mean, max, and min of vector?

See the plotted values — load('diffT.mat') whos('-file','diffT') % diffT neg_vals = nnz(diffT < 0) [lo,hi] = bounds(d...

ungefär en månad ago | 0

| accepted

Answered

How to iterate over data sets?

If you have the Signal Processing Toolbox, use the buffer function for this. dummy1 = (1:60).' bfr1 = buffer(dummy1, 12); ...

How to iterate over data sets?

If you have the Signal Processing Toolbox, use the buffer function for this. dummy1 = (1:60).' bfr1 = buffer(dummy1, 12); ...

ungefär en månad ago | 0

Answered

File Issues after copying from another PC

The resample function is part of the Signal Processing Toolbox. You need to have the Toolbox licensed and installed before you ...

File Issues after copying from another PC

The resample function is part of the Signal Processing Toolbox. You need to have the Toolbox licensed and installed before you ...

ungefär en månad ago | 1

| accepted

Answered

Removing outliers from the data creates gaps. Filling these gaps with missing values or the median of surrounding values does not address the issue.Why?

Your version/release is not stated, however beginning with R2017a, the filloutliers function has been available. Using the 'med...

Removing outliers from the data creates gaps. Filling these gaps with missing values or the median of surrounding values does not address the issue.Why?

Your version/release is not stated, however beginning with R2017a, the filloutliers function has been available. Using the 'med...

ungefär en månad ago | 0

| accepted

Answered

How do I find the x and y coordinates of a fitted Gaussian curve at a given slope?

Once you have the equation for the gaussian, the rest is striaightforward. Find the midpoint in the mamplitude to determine th...

How do I find the x and y coordinates of a fitted Gaussian curve at a given slope?

Once you have the equation for the gaussian, the rest is striaightforward. Find the midpoint in the mamplitude to determine th...

ungefär en månad ago | 0

Answered

Optimal Cutoff Frequency for Static Noise Detection in ECG Signals?

You have not defined ‘static noise’ so I have no idea what you’re actually filtering. The bandwidth of a normal EKG is genera...

Optimal Cutoff Frequency for Static Noise Detection in ECG Signals?

You have not defined ‘static noise’ so I have no idea what you’re actually filtering. The bandwidth of a normal EKG is genera...

ungefär en månad ago | 0

| accepted

Answered

How do I calculate the duration between two times?

This seems to work — load('results_start_array.mat') whos('-file','results_start_array.mat') load('results_start_end.mat')...

How do I calculate the duration between two times?

This seems to work — load('results_start_array.mat') whos('-file','results_start_array.mat') load('results_start_end.mat')...

ungefär en månad ago | 0

| accepted

Answered

how to fill color in 1/4 th circle

A new function in R2024a is the polarregion function. Try this — figure thetas1 = [0.5 1]*pi; radii1 = [1 2]; polarregi...

how to fill color in 1/4 th circle

A new function in R2024a is the polarregion function. Try this — figure thetas1 = [0.5 1]*pi; radii1 = [1 2]; polarregi...

ungefär en månad ago | 0

Answered

How to interpolate values given a starting and end point

Use the rescale function — Vrec = [18.2, 18.1, 18.0, 17.9]; Vrange = [50.6 50.3]; Vres = rescale(Vrec, Vrange(2), Vrange(1...

How to interpolate values given a starting and end point

Use the rescale function — Vrec = [18.2, 18.1, 18.0, 17.9]; Vrange = [50.6 50.3]; Vres = rescale(Vrec, Vrange(2), Vrange(1...

ungefär en månad ago | 0

| accepted

Answered

How can i make 3D graph with multiple 2D graphs?

If the vectors all have the same sizes, just plot them as a matrix using the surf function. t = linspace(0, 1, 25).'; ...

How can i make 3D graph with multiple 2D graphs?

If the vectors all have the same sizes, just plot them as a matrix using the surf function. t = linspace(0, 1, 25).'; ...

ungefär en månad ago | 2

| accepted

Answered

How to change the spectrogram magnitude to linear?

I susp[ect that you may actually want to use the pspectrum function with the 'spectrogram' type. To understand the differences ...

How to change the spectrogram magnitude to linear?

I susp[ect that you may actually want to use the pspectrum function with the 'spectrogram' type. To understand the differences ...

ungefär en månad ago | 0

Answered

Best analysis to show how EEG ranges are similar

I’m not certain what you actually want to do. I would be tempted to use Fourier transforms, specifically stft, and compare th...

Best analysis to show how EEG ranges are similar

I’m not certain what you actually want to do. I would be tempted to use Fourier transforms, specifically stft, and compare th...

ungefär en månad ago | 0

Answered

How to solve non_linear equation

Solve it symbolically — syms z Eqn = z^3 == log(z)*(482036/0.18525)^5 Z = solve(Eqn) Z = vpa(Z) format longG Zd = doub...

How to solve non_linear equation

Solve it symbolically — syms z Eqn = z^3 == log(z)*(482036/0.18525)^5 Z = solve(Eqn) Z = vpa(Z) format longG Zd = doub...

ungefär en månad ago | 0

| accepted

Answered

How to find the intersection of linear regression model and yline

Use the interp1 function for this — T(:,1) = [0 1 2 3 4 5].'; T(:,2) = [0 1 2 3 4 5].'; x = T(:,1); y = T(:,2); p = poly...

How to find the intersection of linear regression model and yline

Use the interp1 function for this — T(:,1) = [0 1 2 3 4 5].'; T(:,2) = [0 1 2 3 4 5].'; x = T(:,1); y = T(:,2); p = poly...

ungefär en månad ago | 0

| accepted

Answered

I am getting this warning "Matrix is singular to working precision." and my surf plot is not showing.

You need to do element-wise opeerations in your ‘u’ function, so: u = @(x,y)(-4*pi*exp(-5*pi*pi*0.5).*cos(2*pi*x).*sin(pi*y))....

I am getting this warning "Matrix is singular to working precision." and my surf plot is not showing.

You need to do element-wise opeerations in your ‘u’ function, so: u = @(x,y)(-4*pi*exp(-5*pi*pi*0.5).*cos(2*pi*x).*sin(pi*y))....

ungefär en månad ago | 1

| accepted

Answered

Designing Yulewalk Filter for a Bandpass Type

The yulewalk filter will be a FIR filter, whiel the original filter is an IIR filter. A FIR filter generally requires a much hi...

Designing Yulewalk Filter for a Bandpass Type

The yulewalk filter will be a FIR filter, whiel the original filter is an IIR filter. A FIR filter generally requires a much hi...

ungefär en månad ago | 0

Answered

Confidence interval calculation. Cannot compute confidence interval for imaginary values.

The parameters aren’t complex. All the results are real. The problem with your code is that in MATLAB, function arguments an...

Confidence interval calculation. Cannot compute confidence interval for imaginary values.

The parameters aren’t complex. All the results are real. The problem with your code is that in MATLAB, function arguments an...

ungefär en månad ago | 0

| accepted

Answered

How to correct the recording of a daamaged accelerometer in earthquake analysis

If you have the Signal Ptocessing Toolbox, an alternative approach would be to use the highpass (or bandpass to also eliminiate...

How to correct the recording of a daamaged accelerometer in earthquake analysis

If you have the Signal Ptocessing Toolbox, an alternative approach would be to use the highpass (or bandpass to also eliminiate...

ungefär en månad ago | 0

| accepted

Answered

How to use previous answer in new calculation n times

Perhaps something like this — A=[0.3 -0.2; -0.6 0.8]; B=[-14;2]; x=[1;2]; y = x; for k = 1:10 y = A*y+B; ym(:,k)...

How to use previous answer in new calculation n times

Perhaps something like this — A=[0.3 -0.2; -0.6 0.8]; B=[-14;2]; x=[1;2]; y = x; for k = 1:10 y = A*y+B; ym(:,k)...

ungefär en månad ago | 0

| accepted

Answered

I have purchased the Signal Processing Toolbox but still get an error when trying to use a function

I am not certain what the problem is. imshow(imread('Screenshot 202....49.59 AM.png')) First, run these from a script or you...

I have purchased the Signal Processing Toolbox but still get an error when trying to use a function

I am not certain what the problem is. imshow(imread('Screenshot 202....49.59 AM.png')) First, run these from a script or you...

ungefär en månad ago | 0

Answered

difference between 2 values in a vector

Try this — x = [0.2 0.0 0.0 0.0 0.25 0.0 0.0 0.0 0.3 0.0 0.0 0.4 0.0 0.0 0.0 ...

difference between 2 values in a vector

Try this — x = [0.2 0.0 0.0 0.0 0.25 0.0 0.0 0.0 0.3 0.0 0.0 0.4 0.0 0.0 0.0 ...

ungefär en månad ago | 0

| accepted

Answered

result spectrogram from lowpass filter still pass frequency above the treshold

See if: y=lowpass(yori,10,100, 'ImpulseResponse','iir'); improves the result. .

result spectrogram from lowpass filter still pass frequency above the treshold

See if: y=lowpass(yori,10,100, 'ImpulseResponse','iir'); improves the result. .

ungefär en månad ago | 0

| accepted

Answered

F1(u,v)=0,F2(u,v)=0 with 4 parameters a,b,c,d, 3 of which (a,c,d) are given

a = 1.5; c = 0.4; d = 0.9; b=0.1:0.1:9; syms u v F1 = @(u,v,b) u*(1 - u) - b*u*v/(c*u + 1); F2 = @(u,v,b) 0.5*b*u*v/(c*u +...

F1(u,v)=0,F2(u,v)=0 with 4 parameters a,b,c,d, 3 of which (a,c,d) are given

a = 1.5; c = 0.4; d = 0.9; b=0.1:0.1:9; syms u v F1 = @(u,v,b) u*(1 - u) - b*u*v/(c*u + 1); F2 = @(u,v,b) 0.5*b*u*v/(c*u +...

ungefär en månad ago | 0

| accepted

Answered

Unrecognized function or variable 'del'.

That should actually work — tic n = 0; for del=0.0:0.4:pi n=n+1; pe(n)=1.2*sin(del); end toc pe A mnore effi...

Unrecognized function or variable 'del'.

That should actually work — tic n = 0; for del=0.0:0.4:pi n=n+1; pe(n)=1.2*sin(del); end toc pe A mnore effi...

ungefär en månad ago | 0