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Walter Roberson


Last seen: Today Actif depuis 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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A répondu
What is the requirement of opinionScores for fitbrisque?
It looks to me as if that should only happen if imds is empty.

environ 8 heures il y a | 0

A répondu
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...

environ 9 heures il y a | 0

A répondu
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^...

environ 10 heures il y a | 0

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A répondu
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_...

environ 14 heures il y a | 0

A répondu
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...

environ 15 heures il y a | 0

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

environ 16 heures il y a | 0

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

environ 17 heures il y a | 0

A répondu
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', '--'...

environ 18 heures il y a | 0

A répondu
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_...

1 jour il y a | 0

A répondu
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...

1 jour il y a | 0

A répondu
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...

1 jour il y a | 0

A répondu
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...

2 jours il y a | 0

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A répondu
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...

2 jours il y a | 1

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

2 jours il y a | 0

| A accepté

A répondu
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)); ...

3 jours il y a | 0

A répondu
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...

3 jours il y a | 0

A répondu
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

3 jours il y a | 0

| A accepté

A répondu
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...

3 jours il y a | 1

A répondu
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; ...

3 jours il y a | 0

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

3 jours il y a | 0

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

3 jours il y a | 1

A répondu
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...

3 jours il y a | 0

A répondu
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...

4 jours il y a | 0

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A répondu
How do I loop through a matrix and break it up into distinct sections?
mask = ismember(YourData(:,2), [55 56]) .'; %row vector result starts = strfind([0 mask], [0 1]); stops = [starts(2:end)-1, s...

4 jours il y a | 0

| A accepté

A répondu
Using continous time in Matlab editor
Pi = sym(pi); syms t phi = Pi * ((31*2/360) - (0.028*sin(2*Pi*t))) % Phase shift (pi.d in rad) & t is time phi ...

4 jours il y a | 0

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A répondu
Does the Symbolic Toolbox Support 0- and 0+ ?
posZ = sym(0); negZ = sym(-0); negZ2 = -sym(0); 1/posZ 1/negZ 1/negZ2 So, no, there is no negative 0 -- if there were then...

4 jours il y a | 0

A répondu
Memory management - variable size array
At the MATLAB level, nearly everything is a variable-sized array. There are relatively few objects that enforce fixed-array limi...

4 jours il y a | 0

| A accepté

A répondu
Unexplicable "Operands to the logical AND .." error from "histogram" command
In R2023a, the first line of histogram.m that is not a comment, is line 134; you are getting the error on line 64. You have som...

4 jours il y a | 1

| A accepté

A répondu
Obtaining frame forces from Sap2000
You have to do a lot of explicit type casting. See https://www.researchgate.net/publication/337200068_SAP2000-MATLAB_Integratio...

4 jours il y a | 0

A répondu
getting data from workspace to Simulink
If you insist on using a From Workspace block, then you need to insert a leading 0 into the vector to act as the time coordinate...

4 jours il y a | 0

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