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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 T0099089; 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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Answered
How to use Runge Kutta method to solve state space equation
(4 by 4) * (4 by 1) --> 4 by 1 (4 by 12) * (12 by 1) --> 4 by 1 4 by 1 + 4 by 1 --> 4 x 1 So that calculation sounds plausi...

ongeveer 9 uur ago | 0

Answered
display table in command window without { }
No, it is not. However, if you only need that for display purposes, then tt = table({1;2;3;4;5},{'A';'B';'C';'D';''},{9;10;11...

ongeveer 10 uur ago | 0

Answered
How to get fzero with 2 variables in array?
I'm trying to solve fzero for each value of x in an array, and I get theis error: Don't Do That. fzero() is defined as only ac...

ongeveer 10 uur ago | 0

Answered
Eliminate a component of an equation
V=1/3*pi.*power(r,2)*h;%m^3 If V = something*h then it follows that h = V/something B=sqrt((r^2)+(h^2)); And that definition ...

ongeveer 11 uur ago | 0

Answered
how to fix invalid setting for fixed-step size in matlab?
You configured the Simulink solver as being a fixed-step algorithm instead as being variable-step. When you do that, then you ca...

ongeveer 11 uur ago | 0

Answered
How to get fzero to work on an array?
I'm trying to solve fzero for each value of x in an array, and I get theis error: Don't Do That. fzero() is defined as only ac...

ongeveer 11 uur ago | 0

Answered
How can I plot the graph of three non-linear coupled ODE's vs. time in xy-plane in MATLAB. I want to use x-axis for time while y axis for x(1),x(2),x(3) thanks
tspan = [0 10]; x0 = [0 0.1 0.2]; [t, x] = ode45(@odefun, tspan, x0); plot(t, x); legend({'x(1)', 'x(2)', 'x(3)'}, 'locati...

ongeveer 12 uur ago | 1

| accepted

Answered
I have a question: Objective function is undefined at initial point.
You have function loglt = lnlt( b,yy) and a0=b(1:2); a1=b(3:4); b1=b(5:6); c1=b(7:8); pp=b(9:10); w...

ongeveer 14 uur ago | 0

Answered
extract/access same fields from multiple structures (it is a nested structure)
temp = [S1; S2; S3; S4; S5; S6; S7; S8; S9]; all_TKE = [temp.TKE]; The above would only work if the structures all have the sa...

ongeveer 18 uur ago | 1

| accepted

Answered
Are there Any Restrictions on Latex Markup in Figure Titles?
The \text is the immediate problem. If you use \textrm instead then you get something

ongeveer 18 uur ago | 0

Answered
plot system of 5 odes over time using ode45
tspan = [0 0.184]; xinit = [10000, 0, 0.01, 0, 0]; [t, y] = ode45(@odefun, tspan, xinit); plot(t, y); legend({'T', 'Q', 'V...

ongeveer 18 uur ago | 2

Answered
Create and dynamically change a continuous tone with user input in MATLAB
See https://www.mathworks.com/help/audio/gs/audio-io-buffering-latency-and-throughput.html In particular, you cannot change t...

ongeveer 23 uur ago | 1

| accepted

Answered
<SOS> Unrecognized function or variable 'setOccupancy'.
It needs the Robotic System Toolbox, R2015a or later. That is the same software and release that introduced binaryOccupancyMap,...

1 dag ago | 0

Answered
FUNCTION shift of vector's position
Take a copy of what is about to be overwriten. Use array subscripts to move the old data to the new positions. For example A(:...

2 dagen ago | 0

Answered
how to create an input window for more than two variables
prompt = {'r1','r2','r3','r4','o2','o2p','o2pp'}; Note that the collected response will be a cell array of character vectors; y...

2 dagen ago | 1

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Answered
How to format scientific notation to have the same power?
table() objects do not support that customization. You would need to switch the items to text

2 dagen ago | 1

Answered
Error with ODE solver for Van der pol equation
Your function receives Y but never uses it, and needs x but does not have a source for x. The simplest fix would be to change...

2 dagen ago | 1

| accepted

Answered
FFT, Inadequate Frequency precision
You need a longer signal to get that resolution. Twice as many points would get you to 10.275 and you would need more than that ...

2 dagen ago | 0

| accepted

Answered
Plot in MATLAB app desinger not working
plot() only draws lines if you supply at least two adjacent finite coordinates in a single call. However you are passing in scal...

2 dagen ago | 0

Answered
creating while loop for two different variable
while delta_a > epsilon || delta_a_prime > epsilon

2 dagen ago | 0

Answered
Error on a single numeric equation
heaviside not heavyside heaviside will not convert that table of conditions into appropriate heaviside calls. You can write y...

2 dagen ago | 0

Answered
Meaning of a code line
! is going to invoke an operating system command. The operating system copy command will be invoked. We can tell by the ..\ t...

2 dagen ago | 0

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Answered
I am getting an error
which gradient The output will likely show you the name of a file that is not provided by Mathworks. You need to rename or ...

3 dagen ago | 0

Answered
Error in 'cable_robot/Frame and Cable Assembly/Left-Rear Cable Assembly': Failed to evaluate mask initialization commands.
Left rear cable assembly block contains some initialization code that is intended to control how the block gets drawn. That code...

3 dagen ago | 0

Answered
How can I write this code lines faster?
Your code works, but it leaves 0s inside the array because it never assigns to even rows or columns. But the zeros do not matter...

3 dagen ago | 1

| accepted

Answered
i am trying to write a MATLAB code to process two different .wav files the first one include a recording for the word “audio” in an approximately 5 seconds length .wav file?
you have to tell audiowrite a file name. You do *not* have to tell it the number of channels. You have to pass the data to be wr...

3 dagen ago | 0

| accepted

Answered
How can I use fminunc with a function that has a vector as output?
You cannot do that. You have a multi objective optimization and need to use gamultiobj or similar. You have fundamental quest...

3 dagen ago | 0

| accepted

Answered
In pplane8, how to increase the number of parameter boxes from 6 to 8
pplane8 is a third party product. You should not expect Mathworks to enhance it. The last time I looked, pplane8 had some err...

3 dagen ago | 0

Answered
Intensity of each pixel frawn on an image
I(p1(2), p1(1):p2(1)) except you should use min and max to ensure that you get increasing order for the column numbers. ...

3 dagen ago | 1

Answered
What does this expression means?
In MATLAB, when you assign into an array that does not already exist, then the array is created and the data type that is associ...

3 dagen ago | 1

| accepted

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