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# Star Strider

##### Last seen: Today
13.275 total contributions since 2012

Hic sunt dracones!

PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation

NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer

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How to concatenate a 3D cell array along the 3rd dimension?
Try this: CellArray3 = cat(3, CellArray1, CellArray2);

28 minutos ago | 0

how to solve this complex equation in matlab?
Try this: syms theta gama Eqn = exp(pi/4*i)*(5+15i)+exp(i*theta)*(25+5i) == 40+exp(i*gama)*(-10+20i); [theta,gama] = vpasol...

alrededor de 12 horas ago | 0

removing all rows with duplicate information in two columns
Try this: a=[1 2 3 4 5; 1 3 4 5 6; 1 2 3 5 5]; [~,~,idx] = unique(a(:,[1 5]),'rows'); tally = accumarray(idx,(1:numel(idx))....

alrededor de 13 horas ago | 0

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Genetic algorithm plot diagram display
It is generally necessary to write your own code to save specific aspects of the ga output. It may be best to adapt the code ...

alrededor de 16 horas ago | 0

How to delete a whole table in the matlab?
tablename = [];

alrededor de 16 horas ago | 1

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How can I separate the arrays when making a table?
Try this: n = 5; A = rand(n,1); B = rand(n,5); T = array2table([A, B]) That should do what you want.

alrededor de 17 horas ago | 1

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how to combine date and time
In theory at least, datetime should be able to do this seamlessly using the timeofday function for the seconds. In practice, it...

alrededor de 22 horas ago | 0

What am I doing wrong? Matrix operators
If you want to raaise the elements of a matrix to a power, use element-wise exponentiation with the dot operator: .^ and see: Ar...

1 día ago | 0

I can't plot a function I created with respect for time
You need to code it as an anonymous function. See Anonymous Functions for details. Specifically: x = @(t) X.*(exp(-Zeta.*...

1 día ago | 0

Error when solving system of equations with ode45 in MATLAB R2019b
The system contains only two derivatives, and . It appears that ‘u’ and ‘z’ are either functions that need to be evaluated, or...

1 día ago | 0

How to plot a function that relies on another function?
Since ‘A’ is a function, it must be evaluated in order to use its results. Try this: A = @(y) y*2; X = @(y) A(y)+10; f...

1 día ago | 0

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How to make this signal linear
If you want to eliminate the low-frequency parabolic(?) trend, the easiest way is to use a digital filter: signal_2 = load('si...

3 días ago | 0

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I'm trying to understand your tables command bugs
Both of these work for me: A = randi([0 20],5, 5); Atable1 = array2table(A, 'RowNames',{'a' 'b' 'c' 'd' 'e'},'VariableNames',...

3 días ago | 0

Designing IIR Butterworth filter (pass band)
Yes. Just define the order as 5. There are different design functions in the Signal Processing Toolbox (butter that I have a...

4 días ago | 0

Play 2 wav files after each other
Use the playblocking function to get them to play the way you want them. [y1, Fs1] = audioread('file1.wav'); %this file i...

4 días ago | 1

I have a function which is ranged from 0 microseconds to 50 microseconds. I just want to plot its exact copies from 0to50 microsecond,50 to 100microseconds,100 to 150 and so on
Try this: Ts=1/200e6; t=Ts:Ts:0.00005; y=[ones(1,2000) zeros(1,8000)]; x=sin(1256e6*t + 2198e10*t.^2); z=x.^y; NR = ...

4 días ago | 0

How to condense a plot with a shorter x-axis?
Divide the x-axis vector by max(x), assuming ‘x’ is the x-axis vector. That will re-scale it without losing any information.

4 días ago | 0

How to avoid a for loop in functions?
Use ‘logical indexing’ and anonymous functions to eliminate the for loop and the if block: PsolWB1 = @(press) (973.-(70400./(1...

5 días ago | 0

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fsolve for non linear equation
One problem is that you called fsolve inside the function. That is not appropriate. The other is that you use global variables...

5 días ago | 0

power law fit to find exponent
I would do this (no Toolboxes required): x = linspace(0, 5, 50); % Create Data y = x.^pi ...

5 días ago | 0

Definite integral without symbolic variables
Create ‘fun’ as an anonymous function, then use the integral function: fun = @(z) (G1 + G2 - 2*cos(k*L1/2) * G0) .* sin(k*(L2/...

5 días ago | 0

kinetic energy of the wind (u and v vectors)
Apparently, ‘h’, ‘u’, and ‘v’ are vectors of the same dimensions. One approach is to code the function as an anonymous functi...

5 días ago | 0

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how to plot euler formula in matlab?
The plot function plots lines between points. You have only one point, so if you change the plot call to: y = exp(100*i*pi) ...

5 días ago | 0

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The dot operator, used with multiplication, division, and exponentiation, creates element-wise oiperations. See Array vs. Matri...

5 días ago | 1

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How to sort the rows of an array according to another vector?
Try this: D=[1 1 0 1 0 1; 4 6 7 8 9 9; 1 1 1 2 3 4]; b=[2 44 0]; [bb,idx] = sort(b,'descend'); Out = D(idx,:) producing: ...

6 días ago | 0

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How to change the values in a matrix
One approach: Before = [ 1 9 9 9 3 8 9 9 9 4 8 9 9 9 ...

6 días ago | 0

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Inverse of algebraic expression in Matlab
Possibly: rfcn = @(E) fsolve(@(r) 1-1/2*((1+r).*log2(1+r)+(1-r).*log2(1-r)) - E, 10); % Anonymous Function: r(E) N = 200;...

6 días ago | 0

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Designing an Arbitrary FIR Filter
This is probably as close as you can get: Frequency = [100 125 160 200 250 315 400 500 630 800 1000 1250 1600 200...

6 días ago | 1

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Plot the Intensity and phase of variation of electric field.
The Fourier transform is easy enough to calculate and plot: t = dlmread('t_spectrum_11480.txt','',1,0); E = dlmread('y_spectr...

6 días ago | 0

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