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# Walter Roberson

Last seen: Today Con actividad desde 2011

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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Respondida
Transparency in scatter plot
scatter(VectorOfX, VectorOfY, VectorOfPointSizes, VectorOfColor, ... 'MarkerFaceColor', 'flat', 'MarkerEdgeColor', 'flat', ...

alrededor de 12 horas hace | 0

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missing year in timetable
The range starts 01-Dec-2020 which is after 2020-01-01

alrededor de 16 horas hace | 0

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Solution is not unique because the system is rank-deficient | Solve Function | Syms Variable | Will be very helpful, if you can resolve this pleaseeee
You are trying to solve three equations for one variable. Although two of the equations are inequalities, solve() simply gives u...

alrededor de 19 horas hace | 0

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Want to buy toolboxes for an older version of Matlab without renewing the license
Historically the rules were: purchasing against a previous release was permitted for a period, a period that was not clearly do...

alrededor de 21 horas hace | 0

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% Example inputs before calling the function ne = 10; nn = 2*ne + 1; mesh.x = linspace(0, 6, nn); mesh.conn = [1:2:nn-2; 2...

alrededor de 21 horas hace | 0

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str2double with long string seems to give wrong answer
format long g str = '6879331413876961408'; num = sscanf(str, '%ld')

alrededor de 22 horas hace | 1

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What is the requirement of opinionScores for fitbrisque?
It looks to me as if that should only happen if imds is empty.

1 día hace | 0

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Find out θ in the cos(wt+θ) = A
eqn2 = solve(eqn2, theta, 'returnconditions', true); will probably return a solution that is parameterized in terms of an extra...

1 día hace | 0

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I am trying to perform the second derivative test of this function I came up with
Q = @(v) sym(v); Pi = Q(pi); E = Q(9.9)*10^6; p = Q(.098); F = Q(1500); L = Q(20); g = Q(32.2)*12; I = (F*L^2)/(E*Pi^...

1 día hace | 0

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The problem with calculating multidimensional integrals
Each layer of integral() that you call passes in a variable-length vector of values. trigl_funcs = @(e) cos( integral(@(zz_...

1 día hace | 0

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Verify the File Path Check File Existence Verify File Permissions Check File Identifier Error Handling for File Openingwith thermo dta to matlab
[f1, msg] = fopen(file_path, 'r'); % Check if file opening was successful if f1 == -1 error('Cou...

1 día hace | 0

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Multiple plots - change x axes all at once once
set(HANDLES_TO_CHANGE, {'XData'}, repmat({NEW_X_VALUES}, size(HANDLES_TO_CHANGE,1), 1));

1 día hace | 0

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How to extract a matrix of values from cell array of cell arrays of structs
msea = zeros(n1,n2); for i=1:n1 msea(i,1:n2) = [mse{i}{1:n2}.metric]; end

2 días hace | 0

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Getting unwanted box in the legend
The boxes in the legend are because you are using surf() You could create dummy lines, H(1) = plot(nan, nan, 'LineStyle', '--'...

2 días hace | 0

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How can you determine the mean and standard deviation on a polar histogram?
You have to do something like norm_angle = Angles; mask = norm_angle > 180; norm_angle(mask) = norm_angle(mask) - 360; mean_...

2 días hace | 0

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Solving and plotting equation with many variables
The solution of solve(eqn, x) is in four parts, with different conditions for each part -- conditions depending on the values of...

3 días hace | 0

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Enforcing values in ODE solver
Use events, and remember that events are only detected when a value crosses the trigger, and are not detected when the system st...

3 días hace | 0

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Getting an fmincon error at initial point
t_LM = (((x(8)-x(7))-(x(6)-x(5)))/log((x(8)-x(7))/x(6)-x(5))); % deltaTLM calcuation - REMEMBER X(9) IS UNCERTAINTY ALSO FIX THE...

3 días hace | 0

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Defining and calling functions in MATLAB
Create a function called tempC2F function tempC2F that will accept an input argument of a single temperature in degrees Celsiu...

4 días hace | 1

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Any way to automatically save my LiveScript .mlx file as a Text-based .m file?
No, there is not.

4 días hace | 0

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I am unable to solve this array dimensional error can someone help please?
function P_battery = EMS(netP, soc) soc_max = 95; % percent battery_max = .116; %kW P_battery = zeros(1, length(netP)); ...

4 días hace | 0

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How increase abaqus calling and running speed from Matlab
Create your abaqus object first. Then pass it around by parameterizing functions; http://www.mathworks.com/help/matlab/math/para...

4 días hace | 0

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Is it possible to add a new cost function to CHOMP?
There is no way to specify a custom cost function for https://www.mathworks.com/help/robotics/ref/manipulatorchomp.html

4 días hace | 0

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Processing cell arrays as a batch instead of one by one
cluster_data = iniclu{i,:}; % I assuming 50 cells of 1st row is read into cluster_data when i = 1 and so on You are d...

4 días hace | 1

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I have this problem Exiting fzero: aborting search for an interval containing a sign change because no sign change is detected during search. Function may not have a root.
syms V Q = @(v) sym(v); Pr = Q(4); R = Q(08206) / Q(10)^5; T = Q(450); Tc = Q(405.5); Pc = Q(1113) / Q(10)^1; P = Pr*Pc; ...

4 días hace | 0

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Time Derivative Properties of Fourier Transform
You cannot -- the fourier transform is based on frequency rather than time.

4 días hace | 0

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Confronting dates in a constrain
Perhaps decision_variable * (date(x) > date(y) + duration) leading to date(y) - date(x) + duration multiplied by something. ...

4 días hace | 1

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Matlab shuts down during loop using audiowrite
I suspect that you are running into a limit on open files -- I suspect that audiowrite() is not closing files. You could experi...

4 días hace | 0

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How do I get my MATLAB code to display an error if the user input number is less than four digits and has less than two distinct numbers?
user = input('Please enter a 4 digit number: ') % User inputs a number digits = num2str(user); if numel(digits) < 4 || l...

5 días hace | 0