Answered
Solving equation with symbolic vector variable
use the dot-notation a = [1 2 3 4]; x = sym('x', [1 4]); eqn = a + 4.*x == x; sol_x = vpasolve(eqn, x) sol_x.x1 sol_x.x2 ...

28 days ago | 1

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Answered
Splitting time into hours : minutes : seconds from a fractional value.
I guess 15.76 means hours in decimal numbers: [h,m,s] = hms(hours(15.76)) d = duration(h,m,s) gives: h = 15 m = ...

28 days ago | 0

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Answered
Why linsolve cannot solve this very simple equation?
To solve this, the rank should be 3. Row 1 and 3 are not linear independent. A = [4,2,2; 5,1,3; 6,0,4] B = [60; 70; 80]; r1...

28 days ago | 0

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Answered
Why find cannot handle this very simple task?
You are dealing with doubles, they are not precisly 0.077 - use round: X = -0.1:.001:.25; find(round(X,3) == .077)

28 days ago | 0

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Storing datetime double in a table
%%%Set this to desired sheet sheet = 'Test'; %Sets Date time format for when table is read opts = detectImportOptions("Weat...

29 days ago | 1

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step respone, impulse response
s=tf('s'); kb=52; k1=156; k2=53; G1=10/(s+0.01); G2=G1/(1+kb*G1); G3=G2*k2*k1; G4=G3/(G3+1); subplot(2,1,1) impulse(G...

29 days ago | 0

Answered
How can I do such a "countifs"(excel) process in Matlab?
You do it by logical indexing: A = randi(10,1,15) CountIf = numel(A(A>5)) gives: A = 9 7 4 10 1 5...

29 days ago | 1

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Dijkstra's Algorithm
You could make life easier using Matlab inbuilt graphs functions. One example is <https://de.mathworks.com/help/matlab/ref/graph...

30 days ago | 0

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How to find the sum of duration if the consecutive row elements are the same?
Save the durations you calculated using *|diff|* in an additional column so that the durations are correct for every row in your...

30 days ago | 0

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How can i sum up 56-year daily precipitation data from APHRODITE (netcdf file) into monthly?
If you organize your data in a timetable you can use retime to sum up monthly.

30 days ago | 0

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Generate new column from cumulating another
A = (1:4)' A(:,2) = cumsum(A) gives: A = 1 2 3 4 A = 1 1 2 3 3 ...

30 days ago | 1

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Answered
mathematical expression from string input
https://de.mathworks.com/help/symbolic/str2sym.html >> fun = str2sym("(sin(sqrt(x)+a) * e^sqrt(x)) / sqrt(x)") fun = (e^...

1 month ago | 1

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Answered
Solve formal equation and get the solution with these variables
syms i1 i2 ib v1 v2 hie hre hfe hoe hfb eqns(1) = i1==-ib-hfe*ib+(v1-v2)*hoe; eqns(2) = i2==hfe*ib+(v2-v1)*hoe %ib==-v1/hie...

1 month ago | 1

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Answered
Importing a table with unknown number of rows
I dont think it is needed to specify this, using readtable function. I never used this option to import a .csv-file as table in ...

1 month ago | 0

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Answered
Problem with solution seemingly simple linear system of equations [0x1 sym]
rewriting the system to matrix shows that this system has no solution, due to inconsistence: d=32; %mm - Srednica tłoka p1=0.5...

1 month ago | 0

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Answered
Integration using trapz method
1 missing bracket and you missed to define dx: d = 30; E0=8.85e-12; c=.1; dx = 0.1; a = 0; b = 1; x = a:dx:b; N = lengt...

1 month ago | 0

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Answered
Meshgrid fo variables in complex equation
You might want to try fimplicit3: syms f(x,y,z) f(x, y, z)=2*x+3*y+4*z==0 fimplicit3(f) or an even more complex example: f(...

1 month ago | 1

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Answered
Define vector v in the code
v=[2,-3,-5,6] result = prod(v(v>0))

1 month ago | 0

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Answered
How to split an cell array of two numbers into two columns
YouWant = [m5{:}]'

1 month ago | 0

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Answered
How to calculate matrix M*T=T
syms T2 T3 M = [1., 0, 0, 0;... 0.5, 0, 0.5, 0;... 0, 0.5, 0, 0.5;... 0 0 0 1.] T = [500; T2; T3; 300] B =...

1 month ago | 0

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Answered
how would i change an undirected network into a directed network on matlab?
here is a small example: A = [0 0 1; 0 0 1; 1 1 0] ug = graph(A) B = zeros(size(A,1)) B = B + triu(A) dg = digraph(B) ...

1 month ago | 1

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Simplify a symbolic expression
syms s T=21.0325 L=3.5890 X=(0.6*T)*((s+(1/L))^2)/s vpa(expand(X),10)

1 month ago | 0

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Answered
which optimization method should I use?
Following your statements surrogateopt appears to be the correct choice.

2 months ago | 0

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Answered
Invalid array indexing. column 19.help
epsilon(i)(xi2(i)((1-epsilon(i)) is not allowed in Matlab, do you mean?: epsilon(i)*(xi2(i)*((1-epsilon(i))

2 months ago | 1

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Answered
Matlab Code (Reinforcement Learning in Finance by Alex Roumi, MathWorks)
The code has never been published. Usually the code used in webinars is published at file exchange, but this was a presentation ...

2 months ago | 0

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Answered
Error using horzcat:: Dimensions of array being concentenated are not consistent
There are 2 times the same values at different indices. To get only the first occourence: S=[.2046e17 .1381e17 .9249e17;.1679e1...

2 months ago | 0

Answered
How do i create a "Cut" at origin?
A = 5; M = 0.8; w = 1.2; fi = 30; t2 = 20; firad = fi*pi/180; t = linspace(0,t2,1000); y = M + A*sin(w.*t + firad); ...

2 months ago | 0

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Answered
Creating matrix with diag command
This is how a normal Matlab user would so this z = diag(1:10) z = 1 0 0 0 0 0 0 0 0 ...

2 months ago | 0

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Answered
not enough input data
Note that i used the same function for step2 like step1 to make it work - replace step2 with the correct function. Also i assume...

2 months ago | 0

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function 'step'.
step(ss(A,B,C,D))

2 months ago | 0

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