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.

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C, MATLAB, Shell, Perl, Fortran
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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...

environ 8 heures il y a | 0

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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...

environ 10 heures il y a | 1

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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...

environ 12 heures il y a | 1

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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 jour il y a | 2

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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 jour il y a | 1

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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 jours il y a | 2

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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

2 jours il y a | 2

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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

3 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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

3 jours il y a | 2

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 1

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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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...

6 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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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 jours il y a | 0

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Walter Roberson

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