Walter Roberson

Last seen: Today | Active since 2011

Followers: 43 Following: 0

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I am currently in the middle of moving, so I am not around very much.

Programming Languages:
C, MATLAB, Shell, Perl, Fortran
Spoken Languages:
English

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vpasolve doesn't work with roots for some equations
vpasolve((-1.2068e+21*x - 2.0765e+20)^(1/2)==-2.2185e+10,x) The left hand side involves a square root. The right hand side invo...

2 hours ago | 0

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Answered
Matlab ilaplace not working properly
syms s sol = ilaplace(40/(s*(2*s^3 + s^2 + 6*s + 2))) disp(char(sol)) fullsol = rewrite(rewrite(sol, 'expandsum'), 'expandroo...

3 hours ago | 0

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I am trying to store all the values of (f) and all the corresponding peaks of the resulting wave in two columns and then plot f vs. peaks, but there is a problem.
findpeaks() is returning different numbers of peaks for each frequency. clc clear all tspan = [0 5]; Ic = 0; A=1; resu...

1 day ago | 0

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how to plot cross hatch over correlation map?
In https://www.mathworks.com/matlabcentral/answers/2141881-how-to-make-a-specific-bar-to-be-hatched-with-a-specific-color#commen...

1 day ago | 0

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Hi, how do I fix the error using superiorfloat? I've tried using double() for the subs() like I've seen suggested before but that caused an error.
eomFunc=odeFunction([thetadot,NOFFEOM],[theta,thetadot],mu,R,m,k); The syntax of odeFunction requires that the third parameter ...

2 days ago | 1

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Identifying Boundary Nodes in a Point Cloud
Your red nodes are sometimes immediately adjacent to your blue nodes. There is no way you will be automatically able to differen...

2 days ago | 0

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Matlab 2024a not starting after Mac OS Sonoma 15.1 Update
I recently upgraded to MacOS Sequoia 15.1.1 (a day after upgrading to 15.1). I am now getting this message for all MATLAB versio...

3 days ago | 0

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como resolver este en matlab
exp(x.^2 + y.^2)

3 days ago | 0

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hello Dear!! I'm a new coming in the community I want your help. about coding on MATLAB does the code is correct ? or the using of (&&) is no faire? and how can I correct it? thank you for respond .
if app.LikeCheckBox.Value==true app.EditField.Value='you Like our channal' elseif app.LikeCheckBox.V...

3 days ago | 0

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Solve 𝑔 ′ ( 𝑥 ) = 0 for z in terms of N, a positive integer
Let's try... Q = @(v) sym(v); syms f(x) g(x) G(z) syms z positive syms N integer assumeAlso(N, 'positive'); g(x) = 4*N*s...

4 days ago | 0

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I want to draw pathline for two particle for a 2d problem
When you use griddedInterpolant, then your x must have all of its columns the same, and the row values must be sorted. Your y mu...

4 days ago | 1

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plot csv with column names used automatically as x and y label
data = readtable("results.csv","TextType","string"); plot(data, data.Properties.VariableNames(1), data.Properties.VariableNames...

4 days ago | 0

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Answered
How could I make a script for this ecuation where i can solve for f?
syms f epsilon D Re Q = @(v) sym(v); eqn = 1/sqrt(f) == -Q(2.0) * log(epsilon/D/Q(3.7) + Q(2.51)/(Re*sqrt(f))) F = solve(eqn,...

4 days ago | 0

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find intervals for both B and C which make the exponential function F converge to some points.
There is no point in calculating most of the F values since we are only interested in convergence. So we only test the last few ...

4 days ago | 0

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Answered
Attempting to interpolate with interp2 and getting errors about the sample point vector?
[x, y] = meshgrid(0:0.01:1, 0:0.01:1); x = [0 1 1 0]; y = [0 0 1 1]; You are overwriting the grids of data produced by meshgr...

5 days ago | 1

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GPU programming for Mac M1
If I recall correctly, someone posted indicating that they had generated mex C++ code that calls into Apple's GPU routines, and ...

5 days ago | 1

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Deciding when to call a Matlab function: Within my symbolic math code, or within my converted numerical code?
Typically you compute in two phases: Symbolic-only phase. Everything that is changeable is generalized as a symbolic variable. ...

6 days ago | 0

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Answered
translation of Simulink generated integers into a 1-D vector
If you have a fixed number of values to process at a time, use the DSP Toolbox buffer blocks, https://www.mathworks.com/help/dsp...

6 days ago | 0

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How to make vectors A1, A2,... A127. Rolling time window.
If you have the Signal Processing Toolbox, you might as well use buffer() https://www.mathworks.com/help/signal/ref/buffer.html...

6 days ago | 0

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How to find the point the graph crosses the x axis
if x(1) == 0 crossing_location = 1; elseif x(1) < 0 %crossing from negative to positive crossing_location = find...

6 days ago | 0

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Trying to create a power factor correction system but no data shows
You have Physical Signals. You need to convert them before Scope. https://www.mathworks.com/help/simscape/ref/pssimulinkconverte...

6 days ago | 0

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Cant show plot on a graph matlab GUI
selectedFunction = app.DropDown.Value; That is going to reply with a character vector even if the Items was initial...

7 days ago | 0

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Is there a way to find the lengths of the contours in fcontour or other?
You can request the ContourMatrix property of the FunctionContour object returned by fcontour . The ContourMatrix contains infor...

7 days ago | 0

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Error in state of SceneNode
txt = sprintf('$T=%.1f^{\\circ}$C'); This will not be an actual degree symbol, but it is close. The LaTeX interpreter does no...

8 days ago | 0

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Need help writing a matlab function.
A deliberately clumsy implementation: function appropriate_element_to_return = hw4_problem3(w, n) array_being_indexed = w; ...

8 days ago | 0

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Define function for transient transient boundary condition
function Trefrig = Trefrig(state.time) thermalBC(thermalmodel,"Edge",7,... "ConvectionCoefficient",hrefrig,... "Ambie...

8 days ago | 0

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Power spectra of bottom pressure at D5, Digital filtering
subplot(3,2,5); % Power Spectral Density (PSD) 및 신뢰구간 계산 [Pxx, F, Pxxc] = pwelch(bottom_pressure, WINDOW, NOVERLAP, NFFT, Fs, ...

9 days ago | 0

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How do I add arrows in evolution analysis figure?
You can use annotation 'arrow'. Unfortunately by itself annotation() uses Normalized coordinates -- normalized relative to the f...

9 days ago | 0

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Every time I run this code, I get "Error using plot Vectors must be the same length.
The equation for guassian pulse does not involve complex numbers. https://doc.comsol.com/6.1/doc/com.comsol.help.comsol/comsol_...

10 days ago | 1

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Answered
Coordinates of objectes in the images
You velocity logic is incorrect. You build up a list of centroids. There can be more than one centroid in any image, and you co...

10 days ago | 0

Walter Roberson

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