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...

2 months 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 ...

2 months 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...

2 months 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...

2 months 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(...

2 months ago | 1

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

2 months ago | 0

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

2 months 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 =...

2 months 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) ...

2 months ago | 1

Answered
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)

2 months ago | 0

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

3 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))

3 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 ...

3 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...

3 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); ...

3 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 ...

3 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...

3 months ago | 0

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

3 months ago | 0

Answered
Getting lowest postive number in array with it's index
S=[-6.3e7 -0.0001e7 inf;5.2545 -.2996e7 inf] m_idx = [min(S(S>0)), find(S==min(S(S>0)))]

3 months ago | 0

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Answered
Changing values in atable
% Example table with random data T = splitvars(table(randi(10,10,5))) T = 10×5 table Var1_1 Var1_2 Var1_3 ...

3 months ago | 0

Answered
Is it possible to change the number of hidden layer in nprtool?
It is - indirectly - use patternet and then use a vector as input: net = patternnet(10); view(net) or if you need more hidden...

3 months ago | 0

Answered
ODE 45 step size changes the turning point
This is not a problem of Matlab, but to the misunderstanding how ode solvers in Matlab work. Read here: https://de.mathworks.co...

3 months ago | 0

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Answered
Check for missing argument or incorrect argument data type in call to function 'log'.
Für mich funktioniert es, wenn ich numerische Werte für die Variablen definiere: TP = 500; RP = 200; PP = 201; EPS = 100; A...

3 months ago | 0

Answered
How do i plot this equation in the time domain
see what this does: t = 0:0.01:2*pi; also read about function handles in Matlab: fun = @(t) 5 * (1 + K * m) .* cos(2*pi.*t) ...

3 months ago | 0

Answered
How do I use trading toolbox to get IB option chain?
Using the help of @Scott Tuttle i wrote a function to download the option chain. It can be downloaded at FEX.

3 months ago | 0

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Submitted


Download Option Chain from Interactive Brokers TWS
Download the option chain from an active TWS session for a specified symbol and date or month and save the results in a table.

3 months ago | 4 downloads |

Answered
runge-Kutta problem command ode45
tspan = [0 5]; y0 = 100; Q = 30; b = 0.2; [t,y] = ode45(@(t,y)Q-b*t*y, tspan, y0); plot (t,y,'-o')

4 months ago | 0

Answered
results are Fractional and long
double(Eint_AB1)

4 months ago | 1

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Answered
Matrix subtraction every two adjacent column
% sample data A = randi(10,5,3) % second col minus first and so on B = A(:,2:end) - A(:,1:end-1) % first col minus secon...

4 months ago | 0

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