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.

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C, MATLAB, Shell, Perl, Fortran
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Answered
Getting error in Inverse Kinematic block using robotics system toolbox for 2 DOF planner robot
rename your MATLAB\inverseKinematics.m to a different name. The current name is interfering with a built-in model with the same ...

ungefär 5 timmar ago | 2

| accepted

Answered
How to make colorbars symmetric?
In order to have the color scale be consistent between the two, the axes CLim property must be the same for the two plots. In pa...

ungefär 11 timmar ago | 0

Answered
how can improve my code performanece, it uses a syms vector, i tried to delete y=t= sym(zeros(1, m + 3)); and it's faster but the solution of the function its wrong
t(k)=(-(4*S*R*k*(k+1)+4*S*R*(k+1))*t(k+2)+(1+FS-b*S*ra-6*S*R^2*(k-1)*k-12*S*R^2*k)*t(k+1)+(-4*S*R^3*(k-2)*(k-1)+2*...

ungefär 12 timmar ago | 0

Answered
Storing parameters from a for loop in arrays
You have theta1(i, :) = theta(1); theta2(i, :) = theta(1); Notice you are storing theta(1) in both cases. You should ...

ungefär 13 timmar ago | 0

Answered
assign name row to table
Either use LastName = ["Sanchez";"Johnson"]; Sistemi_check.Properties.RowNames=LastName; or else LastName = {'Sanchez';'John...

ungefär 14 timmar ago | 2

Answered
Latex Failing for Big Linear System
cla probes = 1:10; base = repmat('\pi', 1, 300); %900 characters for K = 1:length(probes) msg = "$" + base + repmat('x...

ungefär 15 timmar ago | 0

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Answered
How can I solve my for
syms x Caudal=[5.93266E-05, 0.00082573, 0.001571951, 0.002318172, 0.003064541, 0.004018053, 0.00493061, 0.005552929, 0.00654917...

ungefär 17 timmar ago | 0

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Answered
MATLAB giving me a 16x1 complex double answer?
You are using floating point inputs, each of which is inexact. For example is 89.81 intended to represent exactly 8981/100 or is...

en dag ago | 0

Answered
Matrix double and complex double
That algorithm would be for element-by-element multiplication. For * (matrix multiplication) you need to mentally transpose the ...

en dag ago | 0

Answered
Offload figure graphic computations from NVIDIA to local intel GPU
https://superuser.com/questions/1657952/disabling-nvidia-gpu-for-routine-tasks shows how to change your graphics card preference...

en dag ago | 0

Answered
vpa solving 5 equations with 5 unknowns, but result is an empty structure
When you are dealing with symbolic inequalities, you have two choices: You can convert them directly to symbolic equalities, so...

en dag ago | 0

Answered
GLOBAL VARIABLE :HOW USE IT?
Global variables are only reachable within the current workspace. Consider the following code: first(); second(); third(); fun...

2 dagar ago | 2

Answered
Solving the Maximum and Minimum Problems of Multivariate Functions
No. You have coded finite lower bounds and upper bounds for x3, and you have coded a single region for x1. However your problem ...

2 dagar ago | 0

Answered
attaching callback function to a serialdev object.
Callbacks are not supported for serialdev() objects. Note that this serial port lives on the pi and is for connecting an extern...

2 dagar ago | 0

Answered
How can I put shapes (as circles, and arrows) and (multi-rows) texts outside a Matlab plot?
The formal method is to use annotation However note that annotation() cannot use data coordinates, so it can be messy to place...

3 dagar ago | 1

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Answered
I would like to shorten the code, but keep the same type and size of the variable N{t}{w}(i).
N = repmat({repmat({zeros(1,10)}, 1, 3)}, 1, 3)

3 dagar ago | 0

Answered
New tab Sheet using fprintf function
No, that is not possible. csv files are pure text files, and do not have tab sheets. Putting data on other tabs is possible in ...

3 dagar ago | 0

Answered
Will Dropbox new use of Apple file API make things difficult for me?
MATLAB's uigetfile() already uses native operating system file choosers, so if you have been using uigetfile() on MacOS you alre...

3 dagar ago | 0

Answered
error on line 42 : gui_mainfcn(gui_State, varargin{:});
Change delete(instrfind({'Port'},{'COM3'})) clear a; global a; a = arduino(); to global a; if ~isempty(a); clear global a...

4 dagar ago | 0

Answered
Code not showing any result or any error
Your code defines kepler_plot but never invokes it. But you have other problems as well. I had to guess what you were doing. e...

4 dagar ago | 0

Answered
Requesting a demo code for calculating second-order statistics (contrast, correlation, energy, homogeneity, and entropy) for medical images.
Split the code up into two parts: read the medical images into memory arrays code that calculates second-order statistics on m...

4 dagar ago | 0

Answered
Concatenating matrices unable to create a row jump
cruzzi = []; Numeric array. cruzzi{i} = [cruzzi imbinarize(tigger{i,o}, carrey)]; First cycle, cruzzi is the empty nu...

4 dagar ago | 0

Answered
Parameter tunning using GA
You cannot fix that. You are calculating four costs each time, but ga() can only handle one cost at a time. ga() will never be a...

4 dagar ago | 0

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Answered
how to solve this, Error using .* Arrays have incompatible sizes for this operation. Error in Elm (line 156) tempH_test=InputWeight.*TV.P;
The .* (element-by-element multiplication) operator can proceed in the case where: every dimension that is not 1 in either Inpu...

4 dagar ago | 0

Answered
How to use subroutines inside subroutins in GUI functions?
A different one of your questions implies that you are using GUIDE, or hand-building your code -- that in particular you are not...

4 dagar ago | 0

Answered
Is it possible to pass a variable throu a callback function?
Yes. In general see http://www.mathworks.com/help/matlab/math/parameterizing-functions.html However, in the special case of set...

4 dagar ago | 1

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Answered
How to write a subfunction inside a GUI function?
Yes, it is possible. In the case of App Designer you might have to define the function in a separate .m file if it is not a cal...

4 dagar ago | 0

Answered
How to create a protected file
Not really. You can embed a SoC kind of computer within a tamper-resistant covering that would be likely to break with all of...

4 dagar ago | 0

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Answered
Universal Time to Local Time conversion
If LT is datetime() then you need to adjust the Format property of LT I recently encountered someone who was doing a similar ...

4 dagar ago | 0

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Answered
Process .dat file, plot, scale, and put back into similar format
Your code says to scan the file for 8 floating point numbers with commas between them with a delimiter of tab. But your file con...

5 dagar ago | 0

Walter Roberson

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