264 total contributions since 2011

Seismologist

I do not respond to email... however, if you direct me to a particular post on "Answers", then I will certainly take a look.

Professional Interests: earthquake seismology

Answered

After Installation, Matlab 2018a does not open any files

Installation failure does not seem like the culprit in my case - launching R2018b from a RedHat6 Unix machine. I get the exac...

After Installation, Matlab 2018a does not open any files

Installation failure does not seem like the culprit in my case - launching R2018b from a RedHat6 Unix machine. I get the exac...

11 months ago | 0

Answered

How can I get more accurate results when I am integrating Time and Acceleration with Cumtrapz?

I do not use time domain methods to compute the integral or derivative of timeseries data, but you are free to use the code in m...

How can I get more accurate results when I am integrating Time and Acceleration with Cumtrapz?

I do not use time domain methods to compute the integral or derivative of timeseries data, but you are free to use the code in m...

4 years ago | 0

Answered

Integrate acceleration to velocity and displacement

Try using code from my previous post: <http://www.mathworks.com/matlabcentral/answers/21700-finding-the-velocity-from-displac...

Integrate acceleration to velocity and displacement

Try using code from my previous post: <http://www.mathworks.com/matlabcentral/answers/21700-finding-the-velocity-from-displac...

4 years ago | 0

Answered

Gridding and interpolate data

You could use the formulation found in the following reference: Sandwell, D. T. (1987), Biharmonic spline interpolation of GE...

Gridding and interpolate data

You could use the formulation found in the following reference: Sandwell, D. T. (1987), Biharmonic spline interpolation of GE...

5 years ago | 2

| accepted

Answered

How to color TriSurf faces ?

There is a way to get the desired effect without modifying TriSurf function, using above example: % Pretend X, Y, and Z def...

How to color TriSurf faces ?

There is a way to get the desired effect without modifying TriSurf function, using above example: % Pretend X, Y, and Z def...

5 years ago | 2

| accepted

Question

How to color TriSurf faces ?

So... I think I understand how each triangular surface gets colored, for example: % Pretend X, Y, and Z defined above Tri ...

5 years ago | 2 answers | 0

Answered

Generating Standalone Executable file Using Matlab Coder

Check out this "deploytool" tutorial: <http://www.mathworks.com/videos/deploying-applications-with-matlab-68742.html Here> Af...

Generating Standalone Executable file Using Matlab Coder

Check out this "deploytool" tutorial: <http://www.mathworks.com/videos/deploying-applications-with-matlab-68742.html Here> Af...

6 years ago | 1

Answered

How to make loops run faster

Could have something to do with pre-allocation of *Y* There are more elegant ways to do this (I am sure), but if the below mo...

How to make loops run faster

Could have something to do with pre-allocation of *Y* There are more elegant ways to do this (I am sure), but if the below mo...

6 years ago | 0

Answered

Not able to run Matlab Standalone Executable

.mcrCache* files getting corrupted turned out to be the symptom rather than the cause of my issues. The actual reason (as I j...

Not able to run Matlab Standalone Executable

.mcrCache* files getting corrupted turned out to be the symptom rather than the cause of my issues. The actual reason (as I j...

6 years ago | 2

Question

Not able to run Matlab Standalone Executable

I have several Matlab functions that I have turned into standalone executables and have had success running them on several diff...

6 years ago | 2 answers | 0

Answered

how to set the sampling frequency and the time vector for an aperiodic signal while FFT and IFFT

For your second time sample [ t(2) = 0.005 ], your exponential [ exp(-0.005/(4*10^-6)) ] is equivalent to exp(-1250), which is b...

how to set the sampling frequency and the time vector for an aperiodic signal while FFT and IFFT

For your second time sample [ t(2) = 0.005 ], your exponential [ exp(-0.005/(4*10^-6)) ] is equivalent to exp(-1250), which is b...

6 years ago | 0

| accepted

Answered

how automatically label multiple outputs in the loop?

If you know how many elements in *x* there will be (3 in your example), then it is best to initialize the output: x = zeros...

how automatically label multiple outputs in the loop?

If you know how many elements in *x* there will be (3 in your example), then it is best to initialize the output: x = zeros...

6 years ago | 1

Answered

How do I best determine if something is "NaN"?

See documentation for *isnan*

How do I best determine if something is "NaN"?

See documentation for *isnan*

6 years ago | 1

| accepted

Answered

Help needed rearranging data into a matrix

You appear to be overwriting *MODE* for each *k* such that, at the end of the for loops, each element in *MODE* is equal to the ...

Help needed rearranging data into a matrix

You appear to be overwriting *MODE* for each *k* such that, at the end of the for loops, each element in *MODE* is equal to the ...

6 years ago | 0

| accepted

Question

How to determine whether Matlab's Distributed Computing Server is available?

The company I work for has a decent sized HPC facility. I know we have a few licences for the "Parallel Computing Toolbox" (for ...

6 years ago | 1 answer | 1

Answered

Sampling with vectors at the same time

Try this: d = 1:20; A = [24,34,56,66,86]; plot(d,arrayfun(@(x)sum(cos(2*pi*A*x)),d)) Obviously, in this simple case,...

Sampling with vectors at the same time

Try this: d = 1:20; A = [24,34,56,66,86]; plot(d,arrayfun(@(x)sum(cos(2*pi*A*x)),d)) Obviously, in this simple case,...

7 years ago | 0

| accepted

Answered

It is possible to read the graph and it has to produce the Y value for my input X value.

Disregarding the fact that you can determine your *c* value from your *m* value, *x1* value, and *y1* value (or *m*, *x2* and *y...

It is possible to read the graph and it has to produce the Y value for my input X value.

Disregarding the fact that you can determine your *c* value from your *m* value, *x1* value, and *y1* value (or *m*, *x2* and *y...

7 years ago | 0

Answered

Matlab Error, variable, to the left of equals sign

You said you are "just assigning a variable to a number." You mean like this: >> a = 2 a = 2 >> 3 = a ??...

Matlab Error, variable, to the left of equals sign

You said you are "just assigning a variable to a number." You mean like this: >> a = 2 a = 2 >> 3 = a ??...

7 years ago | 0

Answered

How to vectorize this condition switch code

From your more recent question, I found: M=10;N=10;P=4; for m1=-P:M for n1=-P:N s=(m1+P)*(N+1+P)+n1+P+1;...

How to vectorize this condition switch code

From your more recent question, I found: M=10;N=10;P=4; for m1=-P:M for n1=-P:N s=(m1+P)*(N+1+P)+n1+P+1;...

7 years ago | 0

Answered

This calculate error is why?

Instead of determining whether things are equal... determine whether the difference between two numbers are within a tolerance l...

This calculate error is why?

Instead of determining whether things are equal... determine whether the difference between two numbers are within a tolerance l...

7 years ago | 0

Answered

Loop to read in CSV Values by incrementing a part of the Filename

Should be able to do that: M = 201; % Number of CSV files N = 1000; % Number of datapoints in each CSV BAM_186_Torque_8No...

Loop to read in CSV Values by incrementing a part of the Filename

Should be able to do that: M = 201; % Number of CSV files N = 1000; % Number of datapoints in each CSV BAM_186_Torque_8No...

7 years ago | 0

| accepted

Answered

availble solutions for 2D interpolation on non monotonic scattered data

I posted this a while back, perhaps it could be useful here: <http://www.mathworks.com/matlabcentral/answers/17775-gridding-a...

availble solutions for 2D interpolation on non monotonic scattered data

I posted this a while back, perhaps it could be useful here: <http://www.mathworks.com/matlabcentral/answers/17775-gridding-a...

7 years ago | 1

| accepted

Answered

generation of time series by given spetrum( ifft)

In your case, you have: Nyq = 0.5; % Nyquist frequency df = 0.001; % frequency increment Therefore, your array containi...

generation of time series by given spetrum( ifft)

In your case, you have: Nyq = 0.5; % Nyquist frequency df = 0.001; % frequency increment Therefore, your array containi...

7 years ago | 0

Answered

downsampling / reducing fft data for log plot

A possible workaround since you want to compute and retain ALL frequencies, but only plot a subset. You can try plotting a subse...

downsampling / reducing fft data for log plot

A possible workaround since you want to compute and retain ALL frequencies, but only plot a subset. You can try plotting a subse...

7 years ago | 0

Answered

fprintf %E Leading zero

Here is a potentially lame way of doing it: temp_num = 216.6250; temp_str = sprintf('%13.11e',temp_num*10); temp_str = sp...

fprintf %E Leading zero

Here is a potentially lame way of doing it: temp_num = 216.6250; temp_str = sprintf('%13.11e',temp_num*10); temp_str = sp...

7 years ago | 0

Answered

3rd order polynomials in MATLAB?

My answer for a different, but similar question might help (at least for the function for the ramp): <http://www.mathworks.co...

3rd order polynomials in MATLAB?

My answer for a different, but similar question might help (at least for the function for the ramp): <http://www.mathworks.co...

7 years ago | 0

Answered

tapering a clipped Waveform for Fourier analysis??? Need help!

Check out the help pages for *window* Example: t = 0:0.1:10; y = randn(size(t)); plot(t,y,t,window(@hamming,numel(t)...

tapering a clipped Waveform for Fourier analysis??? Need help!

Check out the help pages for *window* Example: t = 0:0.1:10; y = randn(size(t)); plot(t,y,t,window(@hamming,numel(t)...

7 years ago | 0

| accepted

Answered

"Return" and "continue" functions!

*Continue example:* function VALUE = somefunction while SOME_CONDITION DO_THIS; if SOME_OTHER_CONDITION c...

"Return" and "continue" functions!

*Continue example:* function VALUE = somefunction while SOME_CONDITION DO_THIS; if SOME_OTHER_CONDITION c...

7 years ago | 27

| accepted

Answered

Determining polynomial coefficients by known derivatives

Yes. Just in case this is homework, I will give an example to get you started. Let's say you have the case below (I will star...

Determining polynomial coefficients by known derivatives

Yes. Just in case this is homework, I will give an example to get you started. Let's say you have the case below (I will star...

7 years ago | 2

| accepted

Answered

MOD bug? Or something else?

This overloaded *MOD* function seems to overcome my issue: function answer = mod(X,Y) tol = 1e7; X = round(X*tol)...

MOD bug? Or something else?

This overloaded *MOD* function seems to overcome my issue: function answer = mod(X,Y) tol = 1e7; X = round(X*tol)...

7 years ago | 0