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Walter Roberson


Last seen: Today Active since 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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Answered
length error don't know why
The error is not due to length(). The error is due to having run EDwithNetwork() without providing enough parameters In particu...

ongeveer 9 uur ago | 1

Answered
Tracking failed integral2() inside a for loop
Just before the integral2() call warning(''); Just after the integral2 call [msg, lastID] = lastwarn(); If msg is empty then...

ongeveer 16 uur ago | 0

| accepted

Answered
How to convert radian to degree from answer (or equation) generated from syms
Q = @(v) sym(v); Pi = sym(pi); %% INPUTs: E = Q(2)*10^11; % Young's Modulus (in N/m/m) I = Q(3)*10^-3; % Moment of...

1 dag ago | 0

Answered
How to recover corrupted *.mat file data
Unfortunately those files are not in .mat format and cannot be recovered. Both files start with the same sequence of 8 bytes, b...

1 dag ago | 1

| accepted

Answered
Error using plot Vectors must be the same length.
t = (0:(N-1))/fs; s1 = sin(2*pi*10*t); s2 = sin(2*pi*20*t); s = [s1, s2]; s is a row vector that is twice as long as t (sin...

1 dag ago | 0

Answered
Convert polar to cartisian coordinate
pol2cart uses radians. There is no Mathworks supplied Pol2Car function.

1 dag ago | 0

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

2 dagen ago | 0

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

2 dagen ago | 0

| accepted

Answered
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...

3 dagen ago | 0

Answered
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...

3 dagen ago | 0

Answered
Please help me with syntax error on line 52
% 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...

3 dagen ago | 0

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

3 dagen ago | 1

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

3 dagen ago | 0

Answered
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...

3 dagen ago | 0

Answered
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^...

3 dagen ago | 0

| accepted

Answered
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_...

3 dagen ago | 0

Answered
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...

3 dagen ago | 0

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

4 dagen ago | 0

Answered
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

4 dagen ago | 0

Answered
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', '--'...

4 dagen ago | 0

Answered
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_...

4 dagen ago | 0

Answered
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...

4 dagen ago | 0

Answered
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...

5 dagen ago | 0

Answered
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...

5 dagen ago | 0

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Answered
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...

5 dagen ago | 1

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

5 dagen ago | 0

| accepted

Answered
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)); ...

5 dagen ago | 0

Answered
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...

6 dagen ago | 0

Answered
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

6 dagen ago | 0

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Answered
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...

6 dagen ago | 1

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