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Walter Roberson


Last seen: Today |  Active since 2011

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I do not do free private consulting. If you want to bring my attention to something, send a link to the MATLAB Answers location. I am currently caught up to T0099119; if you are waiting on a reply from me for an older issue, please send me a reminder.

Programming Languages:
C, MATLAB, Shell, Perl, Fortran
Spoken Languages:
English

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Answered
how to extract the watermark after decryption. please help I am getting an error in watermark extraction steps. Thank you in advance
for i=1:1:70000 x(i+1)=l*x(i)*(1-x(i))+b*y(i)*y(i)*x(i)+a*z(i)*z(i)*z(i); y(i+1)=l*y(i)*(1-y(i))+b*z(i)*z(i)*y(i)+a...

circa 6 ore ago | 0

Answered
Iterative solution to approach desired value
fzero() or fsolve(). If you need to be able to look at the complete source code then https://www.mathworks.com/matlabcentral...

circa 6 ore ago | 0

Answered
Matlab gives back ''symsum'' formula but not a value
Wolframalpha calculates the first sum numerically, not able to find a closed form for it. What reason do you have to expect t...

circa 7 ore ago | 0

Answered
Baseline Criteria: How to read discrete data from excel rather than continuous data.
https://www.mathworks.com/help/simulink/slref/fromspreadsheet.html configure Interpolation to "zero order hold"

circa 12 ore ago | 0

Answered
Image file saving location
outdir = 'C:\Users\leehj\Desktop\aaa'; for i = 1:5 h = imagesc(X, Y, Z(:,:,i)); xlim([-2 2]); ylim([-1 1]); fname ...

circa 13 ore ago | 0

| accepted

Answered
Can I use the Guide function of MATLAB to create GUI in Raspberry Pi?
No, not a chance. What is supported for the Raspberry Pi is to use Simulink to send images (possibly computed) to the Raspberry...

circa 16 ore ago | 0

| accepted

Answered
So i have a vector of [1x2e6] of frequency data , so I would like to create a loop so that it stores 10 0.1ms (millisecond) this frequency data and fprint it.
Number_per_group = 10; in_groups = buffer(YourSignal, Number_per_group); fmt = [repmat('%8.5f ', 1, Number_per_group - 1), '...

circa 16 ore ago | 0

Answered
Since when has it been possible to dot-index the output of a class method?
Since R2019b. https://www.mathworks.com/help/matlab/release-notes.html?category=language-programming&rntext=&startrelease=R2019...

circa 16 ore ago | 2

| accepted

Answered
cant read the serial port!!!
https://www.mathworks.com/help/matlab/ref/serialport.html feof() is not defined for serialport objects. It was defined for se...

circa 21 ore ago | 0

Answered
I want to design a divider using cordic function, for high number / low number (30/2) can anyone help me.?
Do not start with i=1. Start with i being the negative of the number of bits before the decimal place. I believe that your el...

1 giorno ago | 0

| accepted

Answered
magnetic resonance spectroscopy imaging
* use a higher quality device with a stronger magnetic field * have the device calibrated by experts * make sure that the room...

1 giorno ago | 0

| accepted

Answered
plot textdata with NaN
Give up on reading the file that way. Use readable() instead.

1 giorno ago | 0

Answered
How can I solve this error about nargout function?
(That looks like GUIDE code) You are trying to do code generation with variable numbers of output. MATLAB Coder is not able t...

1 giorno ago | 0

Answered
How to plot 2D location vs corresponding data in MATLAB
You can create a triangulation object and then use trimesh() to plot the data. Or you can create a scatteredInterpolant() obj...

1 giorno ago | 0

Answered
Simulink fixed-step size protected variable name
"Is there any protected variable name for the Fixed-step size solver property pane that can be used in a block?" No, there is...

1 giorno ago | 0

Answered
Why do I receive an error message "archive is not a ZIP archive" during MATLAB installation on Linux?
In current MATLAB versions, a downloader is used that downloads archives as required; when using the downloader, the error just ...

1 giorno ago | 0

Answered
Error installing R2016b: archive is not a ZIP archive
In current MATLAB versions, a downloader is used that downloads archives as required; when using the downloader, the error just ...

1 giorno ago | 0

Answered
How can I plot the population before evaluating fitness in Matlab GA?
You cannot do that using ga() . ga() will never pass the state to the fitness function. You are also assuming that ga() is cr...

1 giorno ago | 0

| accepted

Answered
Now my question what should I add in that code to make the code display 0 on the values less than 0 because now with my code it goes down to the negative values.Thank you.
You should be multiplying logical conditions, not adding them.

1 giorno ago | 0

| accepted

Answered
Matlab keeps shutting down while my program is running
One thing I would check is for overheating <https://www.bestmaccleaner.com/mac-temperature-monitor/> I also suggest testing...

1 giorno ago | 0

Answered
Error in appliying split apply
Sometimes the cause of this is having used a function such as max() that operates along the first non-scalar dimension, together...

2 giorni ago | 0

Answered
How do I manipulate a large row and column datafile and convert each of many bytes to decimal from HEX
Use readlines(), which will return back a string array, one entry per line. Extract the appropriate indices. arrayfun() a ssca...

2 giorni ago | 0

Answered
elemental wise function of any kind not functioning
Give the command format long g and try again. You have format short in effect by default. format does not change the ans...

2 giorni ago | 1

Answered
How to get MATLAB to process the files specified in batch
You can have the code call uigetdir() if you want to prompt the user for the directory name. Or you can make the main functio...

2 giorni ago | 0

Answered
Help please, I want to avoid a warning message.
Upgrade your release. That title is fine in current releases. Question: why are you using \quad there? Why add space at the e...

3 giorni ago | 0

Answered
Index exceeds the number of array elements (63). Error in ANA (line 23) figure;plot(Xdetections(index_maxplot));
You overwrite *all* of XDetections in every iteration of the first loop.

3 giorni ago | 0

| accepted

Answered
why could the mathworks be unable to give me a free trial?
It is not easy to tell where you are located, but when I check, people with names very similar to yours are mostly in Mozambique...

3 giorni ago | 0

Answered
how to solve an equation by using trial and error method?
Multiply both sides by Mx. Subtract the left side from the right. Expand out. You now have a polynomial of degree 2 in Mx.

3 giorni ago | 0

Answered
How can I use mpu6050 without arduino?
The mpu6050 is an i2c device. You need *some* hardware interface, just not necessarily arduino. You could use a raspberry pi...

4 giorni ago | 0

Answered
How to save variables in matlab in most optimal way
fwrite() with the 'bit1' precision. For compression calculations purposes you should never be using the size of mat files. ma...

4 giorni ago | 0

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