Community Profile # Walter Roberson

Last seen: Today 2011년부터 활동

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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loop not recording array
for n = 2:length(raininches) n will be a scalar inside the loop. differences = raininches(n) - raininches(n - 1); scalar ...

대략 1시간 전 | 1

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Why does UIaxes handle is deleted when calling a function and taking inputs as UIaxes handle in MATLAB webapp ?
You are constructing your report by copying existing graphics object into a new uifigure that will act as the report holder. Wh...

대략 4시간 전 | 0

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i am facing invalid bounding boxes while training faster rcnn on multiclasses

대략 5시간 전 | 0

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Trouble with For Loop
If you need to compute different field names for a struct, or different property names for objects, you can use dynamic field na...

대략 5시간 전 | 0

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How to set boundary for solutions in vpasolve?
There does not appear to be a solution between 1.3 and pi/2 radians. Tp = 1 ; Tg = 1.3 ; Te = 1 ; Vp = 480 ; Vg = 587 * (...

대략 18시간 전 | 0

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All three of those toolbox can be purchased for a student license https://www.mathworks.com/store/link/products/student/SV?s_ti...

대략 19시간 전 | 0

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Why do I have an error on line 17 of the code? or there is another error
syms x f=x.^8-7*x.^3 + 7; d=diff(f); d is a symbolic expression in x xo=xo-lambda*d; That symbolic expression in x is u...

대략 21시간 전 | 0

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i'd like to ask is there any function to find asymptotes of an equation y = f(x) that satisfies x = x(t) and y = y(t). I'm new to matlab.
syms t; x_t = (t+1)./(t-1); y_t = (t^2 + 2)./(t^2 - t); limit(y_t, t, -inf) limit(y_t, t, 0, 'left') limit(y_t, t, 0, '...

대략 21시간 전 | 0

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Code runs but no graphical output
E = 200000; % Young's Modulus in N/mm^2 I = 416.667; % Moment on Inertia in mm^2 P = 600; %Applied force in N Q = 1200; %Appl...

대략 23시간 전 | 1

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Arrays have incompatible sizes for this operation.
% Number of points on the ellipse N = 8; % Parametric representation of the ellipse theta = linspace(0, 2*pi, N); x = cos(th...

대략 24시간 전 | 0

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Why do I receive error stating that function needs to appear at the end of the file? MATLAB Differential Equations Help
It is just a Fact Of Life with MATLAB. You have some non-function statements, then you define a function, then you end the funct...

1일 전 | 0

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How do I get normal numerical answers using solve or vpasolve?
Use sym(pi,'d') instead of pi Or... use sympref to set floating point output on Or... Use vpa Or... Use double. For examp...

1일 전 | 0

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Good evening. If possible, I would like a comprehensive explanation of cell-free technology in 6G. If there is a MATLAB code available with it, I would be very grateful.
An explanation of cell-free technology is a large topic that is beyond the scope of MATLAB Answers. Providing MATLAB code for a...

1일 전 | 1

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Can I upload excel input and output data in PSO to define objective
Yes. It is inefficient to do this for inputs; you should instead read the data once before the pso() call and use function para...

1일 전 | 0

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error: Undefined function 'on' for input arguments of type 'double'. How can i fix this error (i use matlab app designer)?
typefunction = app.TypefunctionEditField.Editable; fxi=str2func(typefunction); typefunction contains something that includes...

1일 전 | 0

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I have 4 inputs (P,T,V,H) and 1 output (TS). I want to optimize for TS (maximize in this case). Can I use PSO for this purpose
Yes you can. You might find it easiest to use Problem Based optimization.

1일 전 | 0

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I code a bisection method on MATLAB app designer, how can I fix this error ?
fxi=str2func(['@(x)'typefunction]); You need a space or comma, like fxi=str2func(['@(x)' typefunction]);

1일 전 | 0

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Ode45, Events error: SWITCH expression must be a scalar or a character vector
I have seen this before when the person had a third-party version of lower in their MATLAB path. Please show which -all lower ...

1일 전 | 0

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Generate specific binary combination
N = 4; for K = 0 : 2^N - 1 thiscombo = dec2bin(K,N); stuff end

2일 전 | 1

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selected cell in table app designer
https://www.mathworks.com/help/matlab/ref/matlab.ui.control.table-properties.html#mw_1135e93c-c65f-4439-9112-dc80ae0d6d65 Selec...

2일 전 | 0

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I don't know how to solve the error it is producing
fun = @(b, t) cost(db, tb, P, E, H, rho, numIters, segments); fun is a function that expects two parameters, and ignores both o...

2일 전 | 0

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Need to simulate a keypress in a matlab script
https://www.mathworks.com/matlabcentral/fileexchange/28603-inputemu-keyboard-mouse-emulator-v1-0-1 https://www.mathworks.com/m...

2일 전 | 0

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Issues with surface plotting using a large table of data
surf(vector_of_length_54, vector_of_length_12, Your_12_by_54_data) Remember that horizontal (rows) corresponds to Y axes, and v...

2일 전 | 0

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LDPC encoding using MATLAB encoder
I = randi([0 1],43200,1); % INFORMATION BITS H = dvbs2ldpc(2/3); l = comm.LDPCEncoder(H); codeword = l(I);

2일 전 | 1

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Why these two path strings are different? (manual string vs. pwd + fullfile)
You will find that on MacOS and Linux (including here on MATLAB Answers) that fullfile uses / separators

2일 전 | 0

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Direct calculations on tables - elementwise mean of n-tables
cellfun table2array, cat(3) the expansion of the resulting cell, mean() across the third dimension. array2table the results givi...

2일 전 | 0

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Is there a uicontrol to let user rearrange rows of strings?
No there is no uicontrol for that purpose.

2일 전 | 0

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Why I can not start the parpool? I just upload the MATLAB and Toolbox, is this question related to the Lenovo system?

2일 전 | 0

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