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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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...

12 minutes 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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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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Answered
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...

6 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...

6 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...

7 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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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

Answered
Why Is Colon Operator Not Equivalent To linspace Command?
The colon operator is defined to use repeated addition. When the increment does not happen to be an integer multiple of a power ...

10 days ago | 0

Walter Roberson

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