Walter Roberson

Last seen: Today | 自 2011 起处于活动状态

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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已回答
Matlab R2021a quit.
The code was attempting to use the third party package refprop version 9.0 or 8.1, which was for 2013 to 2016. The mex file used...

1 hour 前 | 0

已回答
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...

8 hours 前 | 1

| 已接受

已回答
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...

8 hours 前 | 0

已回答
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...

9 hours 前 | 0

| 已接受

已回答
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...

11 hours 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'; ...

12 hours 前 | 0

已回答
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. ...

24 hours 前 | 0

已回答
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 day 前 | 1

| 已接受

已回答
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 day 前 | 0

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已回答
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 day 前 | 1

已回答
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 day 前 | 1

已回答
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 day 前 | 2

已回答
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 day 前 | 0

已回答
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 day 前 | 0

已回答
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 day 前 | 1

已回答
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 days 前 | 1

已回答
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 days 前 | 1

已回答
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 days 前 | 0

已回答
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 days 前 | 0

已回答
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 days 前 | 0

已回答
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 days 前 | 0

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已回答
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 days 前 | 0

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已回答
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 days 前 | 0

已回答
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 days 前 | 1

已回答
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 days 前 | 0

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

4 days 前 | 1

| 已接受

已回答
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 days 前 | 0

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

4 days 前 | 0

已回答
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 days 前 | 0

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已回答
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 days 前 | 0

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