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Walter Roberson


Last seen: Today Active since 2011

Followers: 19   Following: 0

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I am currently in the middle of moving, so I am not around very much.

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

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  • Most Accepted 2023
  • Most Accepted 2022
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  • Most Accepted 2021
  • Roberson Cup
  • Most Accepted 2019
  • Most Accepted 2018
  • Most Accepted 2017
  • 36 Month Streak
  • Most Accepted 2016
  • Most Accepted 2015

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Answered
Does Matlab automatically vectorize for loops?
Years ago, I recall reading that Matlab automatically vectorizes for loops. I cannot find any such mentions now. Is this just ...

11 days ago | 0

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Answered
I am very new to MATLAB but I have to deliver an assignment. How do I solve matrix dimension issue in line 10 and 11.
Your ldf is 39360 x 1. Your ql is 1 x 3936. Select rows and columns out of those and you get 1 x 1 and 1 x 1. Use * to multiply ...

12 days ago | 0

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Answered
ERROR: Error using {} Variable index exceeds table dimensions. How to apply function to all cells/tables?
first_table = results_velocity_diff{1, 1}; % Initialize a cell array to store the results results = cell(1, width(first_table)...

13 days ago | 0

Answered
Why I can't plot x = years , y = GDP
GDP.("YEARS") retrieves the field Years from the GDP object, and displays the result (because you have no semi-colon on the lin...

13 days ago | 1

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Answered
Incosistency Precision Value (decimal double) When using strcmpi/contains
By default, string() of a double precision number gives a result to 5 digits of precision. a = 0.367265 string(a) To get more...

13 days ago | 0

Answered
Hypergeometric functions(1F2) in matlab
In MATLAB, some of the parameters are implicit according to the length of the other parameters. function result = hypegeo(q, r)...

13 days ago | 1

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Answered
convert double to signed int
Depending on how the input is stated... value = 0x9C40s16

13 days ago | 1

Answered
integral of the besselj function
syms nu x result = int(besselj(nu, x), x, 0, 4*sym(pi)) Bessel J is a family of functions, distinguished by the value. You ca...

14 days ago | 0

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Answered
I have purchased the Signal Processing Toolbox but still get an error when trying to use a function
Depending exactly how you install the toolbox, situations can arise where a toolbox is installed but the license is not updated....

14 days ago | 0

Answered
Make only the highest values of grayscale image transparent
image(BackgroundImage); imageMax = max(YourGrayscaleImage(:)); alphaMask = double(YourGraycaleImage == imageMax); hold on ...

14 days ago | 0

Answered
Are functions called in parfor independent from each other
No, there will be a difference. Linear for loop uses a single random number stream (unless you deliberately change this.) parf...

14 days ago | 0

Answered
One function is greater than other
Q = @(v) sym(v); syms z real assume(z > exp(1)) % Define the function f = z - Q(802)/Q(10)^2 * log(z) == (Q(3359)/Q(10)^3...

14 days ago | 0

Answered
MATLab does not solve for my variable and only solves the root of the equation
syms a H Q x y z b c d e f g h eqn = x + y*a + z*H + b*a^2 + c*H^2 + d*a^3 + e*H^3 + f*a*H + g*a^2*H + h*a*H^2 == Q; solutions...

14 days ago | 0

Answered
matlab serialport in s-function error with Undefined function 'write' for input arguments of type 'string'
You do not initialize serialObj within the same scope as the persistent declaration. You end up passing empty serialObj everywhe...

1 month ago | 0

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Answered
in y axis i want 10^(-2000). can anyone plz help
1e-2000 would underflow to 0. You can only use such a number symbolically... but symbolic numbers cannot be used as limits. Y...

1 month ago | 0

Answered
What are the possible reasons for data jumps in the plot?
Q = @(v) sym(v); Pi = Q(pi); A0 = Q(15207)/Q(10)^4; A1 = Q(0853721)/Q(10)^6-Q(1816893)/Q(10)^6*1i; A2 = Q(1); th = ...

1 month ago | 0

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Answered
Why License Manager Error -9,57 if the username MatLicence/Window is the same?
You have to use the Windows internal username, not the Windows Live email address. https://www.mathworks.com/matlabcentral/answ...

1 month ago | 0

Answered
calculate the area of the black colored objectes in a image
stats = regionprops(YOUR_BW_IMAGE, 'Area'); areas = [stats.area]; total_area = sum(areas);

1 month ago | 0

Answered
Matlab ODE Solvers - Paramater Question
To pass an additional parameter, use http://www.mathworks.com/help/matlab/math/parameterizing-functions.html However... for the...

1 month ago | 0

Answered
Can't read external drives
System Preferences --> Privacy & Security --> Full Disk Access Click on the "+" at the bottom middle . Authenticate. Select /Ap...

1 month ago | 0

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Answered
Getting arrow key presses in code without any figures
You can potentially use one of the routines from PsychToolbox; https://www.mathworks.com/matlabcentral/answers/143088-real-time-...

1 month ago | 0

Answered
"Empty sym" when solving a system of linear equations with different conditions
Sol = solve([eqn1 eqn2 eqn3 eqn4 ... cond1 cond2 cond3 cond4 ... cond_gear5_1 cond_gear5_2 ratio], i) That is a reque...

1 month ago | 0

Answered
Can I update my Matlab behavior
In the MATLAB editor, if you start with examplepath = 'this\is\a\path\' and position your cursor at the path part and press re...

1 month ago | 1

Answered
Replace certain columns in a structure array
[Data(30:60).Temperature] = deal(20); [Data(61:80).Temperature] = deal(24);

1 month ago | 0

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Answered
License Error while running Yolov4 object detector
It sounds as if you are configured for multiple license servers, and the license server you normally use does not have a license...

1 month ago | 0

Answered
I need a link and password to the MATLAB software accompanying the text Business Finance and Economics with MATLAB
The link to the software is https://www.andersoneconomicgroup.com/Portals/0/Zipped%20Toolbox.zip I do not know what the passw...

1 month ago | 0

Answered
Is there a way to use fill with animatedline?
No, animated lines cannot handle fill. Consider instead creating a hgtransform for each tile. To move the individual tiles, set...

1 month ago | 0

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Answered
How to do I get the standard deviation from an eeg input signal in SImulink?
The instantaneous standard deviation of a signal is 0. Standard deviation normally depends on a complete population -- a comple...

1 month ago | 0

Answered
How do I add a column to table?
You can add a new table variable by using either dot notation or the "addvars" function. Dot notation adds new variables to the ...

1 month ago | 2

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Answered
Can't use conv() after using coeffs()? It works when manually inputting the coefficients but doesn't when it is taken using coeffs
syms s eq1 = 2*s^2 + 3*s - 1; N = coeffs(eq1, 'All'); eq2 = s^3 +6*s^2 + 1; D = coeffs(eq2, 'All'); T = conv( double(N)...

1 month ago | 0

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