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Walter Roberson


Last seen: Today |  Attivo dal 2011

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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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Risposto
uifigure alternatives for gcf, gcbf, gco, gcbo, gca, and any other legacy figure based functions
I used to think that those functions simplify didn't apply to uifigure and children. However someone indicated that the real iss...

circa 6 ore fa | 0

Risposto
can you specify a newly created sheet to be at the start of a spreadsheet using writetable?
no, writetable cannot manipulate the tab order. If you happen to be using Windows see https://www.mathworks.com/matlabcentral...

circa 8 ore fa | 1

| accettato

Risposto
helps to solve objective function with restriction, to obtain the value of the constant C
The integral of the density function must be exactly 1. The c is a constant multiplier. So if you calculate the integral without...

circa 10 ore fa | 1

Risposto
All functions in a script must be closed with an 'end'.
Delete or comment out everything from the "function" line. * Your script never invokes the function * functions inside a scr...

1 giorno fa | 2

Risposto
min and max Functions Breaking After Conversion From Symbolic to MATLAB Function
Symbolic variables (that are not symmatrix) are scalars. For scalar x, min(5,x) is the same as min([5,x]) Symbolic operations...

1 giorno fa | 1

| accettato

Risposto
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 ...

2 giorni fa | 2

| accettato

Risposto
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...

2 giorni fa | 0

Risposto
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*...

2 giorni fa | 0

Risposto
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 ...

2 giorni fa | 0

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

2 giorni fa | 2

Risposto
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...

2 giorni fa | 0

| accettato

Risposto
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...

2 giorni fa | 0

| accettato

Risposto
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...

3 giorni fa | 0

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

3 giorni fa | 0

Risposto
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...

3 giorni fa | 0

Risposto
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...

3 giorni fa | 0

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

3 giorni fa | 2

Risposto
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 ...

4 giorni fa | 0

Risposto
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...

4 giorni fa | 0

| accettato

Risposto
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...

4 giorni fa | 1

| accettato

Risposto
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)

4 giorni fa | 0

Risposto
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 ...

5 giorni fa | 0

Risposto
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...

5 giorni fa | 0

Risposto
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...

5 giorni fa | 0

Risposto
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...

5 giorni fa | 0

Risposto
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...

6 giorni fa | 0

Risposto
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...

6 giorni fa | 0

Risposto
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...

6 giorni fa | 0

| accettato

Risposto
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...

6 giorni fa | 0

Risposto
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...

6 giorni fa | 0

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