# Walter Roberson

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.

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**Content Feed**

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

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

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

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

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

Convert polar to cartisian coordinate

pol2cart uses radians. There is no Mathworks supplied Pol2Car function.

1 dag ago | 0

Transparency in scatter plot

scatter(VectorOfX, VectorOfY, VectorOfPointSizes, VectorOfColor, ... 'MarkerFaceColor', 'flat', 'MarkerEdgeColor', 'flat', ...

2 dagen ago | 0

missing year in timetable

The range starts 01-Dec-2020 which is after 2020-01-01

2 dagen ago | 0

| accepted

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

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

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

str2double with long string seems to give wrong answer

format long g str = '6879331413876961408'; num = sscanf(str, '%ld')

3 dagen ago | 1

| accepted

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

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

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

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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_...

3 dagen ago | 0

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

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

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

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

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

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

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

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

| accepted

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

Any way to automatically save my LiveScript .mlx file as a Text-based .m file?

No, there is not.

5 dagen ago | 0

| accepted

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

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

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

| accepted

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