Walter Roberson

Last seen: Today | 2011 年からアクティブ

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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Unexpected behavior in classdefs that inherit from handle
This is documented. https://www.mathworks.com/help/matlab/matlab_oop/initialize-property-values.html#brqy3km-10 MATLAB evalua...

約7時間前 | 1

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Help me plot the solution in graph
A = randi([-9,9]) B = randi([-9,9]) C = randi([-9,9]) fun1 = @(x,y) A*x + B*y + C A2 = randi([-9,9]) B2 = randi([-9,9]) C2...

約8時間前 | 0

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error when plotting 3 first order differential equations
syms x; You created x as a scalar symbolic variable. soln = ode45(@Problem03ODEFunction,[0 10],[0;0;0]); You calculate the so...

約8時間前 | 0

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Index exceeds the number of array elements (1).
format long g h = rand() %guess L = rand() * 3 %guess F = sort(rand(1,7)) %guess a = rand(size(F)) %guess b = ran...

約11時間前 | 0

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processing a file but keeping blank lines intact
ConstantOffset = as appropriate; filename_in = 'as appropriate'; filename_out = 'as appropriate preferably not the same'; ...

約11時間前 | 0

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How to keep the values for particular dimension of a matrix and rest of the dimension will be zeros?
Easy way: B = zeros(size(A), 'like', A); B(350:400,20:35) = A(350:400,20:35); Now B is A with all the other elements zeroed. ...

約23時間前 | 0

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I am confused on why I am getting huge numbers at the values 0,75,150, and 300 in my code
Algebraically, b should be 0 at 0, 150, 300 (but not 75), and division by 0 gives infinity. In the below plot, you do not see th...

1日前 | 1

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How to prevent unwanted line breaks when using sgtitle function in figure?
pt_blk is a cell array so pt_blk(si) is a cell array. ['Pt: ', {'429-040 vs 041'}, ', Contact:'] Alternately, pt_blk might be...

1日前 | 0

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Matlab creates same input values every time? Why?
Every time you load matlab, it does the equivalent of rng('default') which initializes the seed to 0. It is expected that the ...

1日前 | 1

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generate new coordinates (starting from initial coordinates) that are arranged outwards (by a distance H) and on the same plane
which are arranged outwards (by a distance H) I doubt that you want to arrange the points by distance H, but here it goes. lo...

1日前 | 1

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multiple colorbars in one figure
You can create multiple colorbar() using the 'Position' property. If colorbar() believes that a new colorbar overlaps an existin...

1日前 | 2

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Using an anonymous function handle as input into another function handle
Your premise is incorrect. The below example shows that it is valid to pass function handles between multiple levels omega = @(...

1日前 | 0

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use the 'patch' function with different results (using different matrices)
In your first patch() call you ask for 'k' -- black -- for the faces. The edge colors default to black as well. In the second p...

1日前 | 0

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How to test if equation in .p file is linear.
In some cases you might get lucky, in that if you pass purely symbolic variables to the function, you might get back a formula. ...

1日前 | 1

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Isosurface plots appear 2d when used with subplot
MATLAB has divides graphics calls into "high level" and "low level". "High level" calls check whether hold is on, and if not...

3日前 | 1

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Problems with savepath in R2023b
On a shared system, users should not have write access to pathdef.m inside the MATLAB installation directory. If this is not a ...

3日前 | 1

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I'm trying to make a for loop that has if statments that use the increments from my i to run them. How can I make this work, it won't run.
if i==0:99 The right-hand side of that == is a vector containing [0, 1, 2, 3, ... 99] The == is comparing the current valu...

3日前 | 0

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Using lsqnonlin and getting the message Error line 218.
clear all; clc; close all L=[3,3,3]; %starting point of electrode's position LEb=zeros(1,1); for xa...

3日前 | 0

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Algorithm 1. Set time step (increment) 2. set max number of time steps 3. start with ground values of temperature at x=0, y=0, z=0, theta=0, and a particular value of fi 4. co
Remember that comments extend to the end of the physical line, not to the next semi-colon, so your comment about "Initialize var...

3日前 | 0

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How do I use single precision numbers in a summation? My result is not coming out as expected.
You are not doing repeated addition. Repeated addition is not the same as multiplication. Also, a and b are scalar, so a*b is a...

3日前 | 0

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I can not run my function file for zohplot
When you attempt to run a function by pressing the green Run button, MATLAB never, I repeat never searches the calling environme...

3日前 | 0

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How to Find Duplicate Entries and give popup message in the 50 different Edit Field in MATLAB App Designer ?
[groupnum, group_content] = findgroups(app.YourGUITable.Data.Period); if numel(groupnum) == height(app.YourGUITTable.Data) ...

3日前 | 0

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Number of values stored are more than the ratio of stop Time/Step size ?
See https://www.mathworks.com/help/simulink/ug/choose-a-solver.html and https://www.mathworks.com/help/simulink/ug/managing-samp...

4日前 | 1

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Error 2, 753 when trying to activate key
First off: if you were installing the license server facilities, then the resulting MATLAB would not need to be activated -- bec...

4日前 | 0

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error to assign string in field struct's
Compare: Sis(73).Slipp = 'example'; [Sis.SlippSource] = testfun(); function output = testfun() output = 123; end

4日前 | 1

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Licence manager changes / Activate and manage devices
Notice that the "Option" field is "Total HeadCount". The implication is that the license is not an individual license -- the "Ma...

4日前 | 0

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ascribe zeros to an array
frequencies = linspace(0, 2400, 250); spectrum = rand(size(frequencies)); subplot(2,1,1); plot(frequencies, spectrum); title...

4日前 | 0

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How can I resolve the error in output for a WSN simulation in MATLAB
endToEndDelay = endToEndDelay + (t - transmissionTimes(node)); You never reset endToEndDelay, so it becomes unclear...

5日前 | 0

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how to use vpasolve to solve the equation sin(x)==0 in the range of (0,5] instead of [0,5]?
vpasolve() does not support open or semi-open intervals. The trick is to use syms x sol = vpasolve(sin(x)==0, x, [1e-63 5]) ...

5日前 | 0

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Subs returns empty sym n-by-0
subs(expr,sol) If sol is a struct output of solve() with returnparameters but there were no auxiliary variables introduced ...

5日前 | 0

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