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...

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 ...

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...

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...

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(...

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))

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{:}]'

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 =...

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) ...

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)

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.

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))

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 ...

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...

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); ...

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 ...

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...

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

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)))]

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 ...

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...

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...

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...

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) ...

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.

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

| accepted

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')

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

Hello dear, can anybody helping me, how can I calculate this matrix in Matlab, i want to find this Unknown value, Ma and Va?

A = [1 5; 0 1] b = [46; 16] sol = A\b

Hello dear, can anybody helping me, how can I calculate this matrix in Matlab, i want to find this Unknown value, Ma and Va?

A = [1 5; 0 1] b = [46; 16] sol = A\b

4 months ago | 0

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...

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