Knowledge means knowing where it is written...

Interested in:

- Optimization

- Mathematical Modelling

- Improvement of my programming skills

Answered

Environment Reinforcment learning Matlab

See this link to the documentation: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-reinforcement-learnin...

Environment Reinforcment learning Matlab

See this link to the documentation: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-reinforcement-learnin...

1 dag ago | 0

Answered

Custom Environment for Reinforcment learning

There is a step-by-step example in the documentaion: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-rein...

Custom Environment for Reinforcment learning

There is a step-by-step example in the documentaion: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-rein...

1 dag ago | 0

Answered

Please tell me how?

You need to perform a inverse laplace transformation: num=134; den=[1 16 134]; x=tf(num,den) subplot(1,2,1) step(x) title(...

Please tell me how?

You need to perform a inverse laplace transformation: num=134; den=[1 16 134]; x=tf(num,den) subplot(1,2,1) step(x) title(...

3 dagen ago | 1

Answered

write function that generates an echo to audio

Hi Franziska, there is no need for loops: % Load sample sound load TestSoundEcho.mat; % Play sample sound sound(data, fs)...

write function that generates an echo to audio

Hi Franziska, there is no need for loops: % Load sample sound load TestSoundEcho.mat; % Play sample sound sound(data, fs)...

3 dagen ago | 0

Answered

Output a solution for a function at a specific value input

magT = @(omega)sqrt((5.903*10^24)^2+(1.181*10^20*omega)^2)/sqrt((1.181*10^25-(2.361*10^16*omega^2))^2+(9.445*10^20*omega)^2); ...

Output a solution for a function at a specific value input

magT = @(omega)sqrt((5.903*10^24)^2+(1.181*10^20*omega)^2)/sqrt((1.181*10^25-(2.361*10^16*omega^2))^2+(9.445*10^20*omega)^2); ...

3 dagen ago | 0

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Answered

solving integral in matlab

What you are looking for is an analytical solution. The integral function does solve numeric. To solve symbolic use int as John ...

solving integral in matlab

What you are looking for is an analytical solution. The integral function does solve numeric. To solve symbolic use int as John ...

3 dagen ago | 1

Answered

Split data into groups

A = randi(5000,300,1); % random data A = sortrows(A); % sort it low = A(1:100); % just use indexing now mid = A(101:200); hi...

Split data into groups

A = randi(5000,300,1); % random data A = sortrows(A); % sort it low = A(1:100); % just use indexing now mid = A(101:200); hi...

4 dagen ago | 0

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Answered

Syntax error when opening a file using a path. it says " use a newline, semicolon, or comma before this statement "

It is unclear what you want: maybe you forgot to underline your variable name function_data = angleAnalysis_withPlots('C:/rese...

Syntax error when opening a file using a path. it says " use a newline, semicolon, or comma before this statement "

It is unclear what you want: maybe you forgot to underline your variable name function_data = angleAnalysis_withPlots('C:/rese...

4 dagen ago | 0

Answered

HELP: looping a function and plot (ode23)

tspan1 = [0, 4]; tspan2 = [4, 10]; y0 = [0, 0]; [t1_r1, y1_r1] = ode23(@(t,y) fun(t,y,0.5,5), tspan1, y0); [t2_r1, y2_r1] ...

HELP: looping a function and plot (ode23)

tspan1 = [0, 4]; tspan2 = [4, 10]; y0 = [0, 0]; [t1_r1, y1_r1] = ode23(@(t,y) fun(t,y,0.5,5), tspan1, y0); [t2_r1, y2_r1] ...

4 dagen ago | 1

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Answered

problem with table / array/cell

Your table content is a cell array - Read the Tips section from the documentation. It tells you why and how to deal with it. ce...

problem with table / array/cell

Your table content is a cell array - Read the Tips section from the documentation. It tells you why and how to deal with it. ce...

4 dagen ago | 0

Answered

Solve ODE with BC

I doubt that your ode has an analytical solution - however here is a minimal working example of how to include BC's in a symboli...

Solve ODE with BC

I doubt that your ode has an analytical solution - however here is a minimal working example of how to include BC's in a symboli...

4 dagen ago | 0

Answered

Respective matrices for different sheets in imported file frin excel

Use the 'sheet' option like shown here: https://de.mathworks.com/help/matlab/ref/readtable.html#d120e1047964 contentTable = rea...

Respective matrices for different sheets in imported file frin excel

Use the 'sheet' option like shown here: https://de.mathworks.com/help/matlab/ref/readtable.html#d120e1047964 contentTable = rea...

4 dagen ago | 0

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Answered

I'm trying to integrate, but I get an "undefined function" error.

int does not accept numerical inputs, because it performs symbolic integration - so you have to define a numerical vector for t ...

I'm trying to integrate, but I get an "undefined function" error.

int does not accept numerical inputs, because it performs symbolic integration - so you have to define a numerical vector for t ...

4 dagen ago | 0

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Answered

Error using vertcat Dimensions of arrays being concatenated are not consistent. For solving ODE

tspan = [0 60]; %Initial Value C_V0 = 0; %x(1) C_I0 = 0; %x(2) C_C0 = 2; %x(3) C_W0 = 0; %x(4) C_G0 = 0; %x(5) [t,x] ...

Error using vertcat Dimensions of arrays being concatenated are not consistent. For solving ODE

tspan = [0 60]; %Initial Value C_V0 = 0; %x(1) C_I0 = 0; %x(2) C_C0 = 2; %x(3) C_W0 = 0; %x(4) C_G0 = 0; %x(5) [t,x] ...

4 dagen ago | 1

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Answered

calling a variable in another function

function [LookupTableFiles]=getaerotablelisting( FilePrefix, DirectoryName , filetype ) FileList = dir('DynamicData...

calling a variable in another function

function [LookupTableFiles]=getaerotablelisting( FilePrefix, DirectoryName , filetype ) FileList = dir('DynamicData...

7 dagen ago | 0

Answered

Easily solved equation isn't being solved by 'solve'

There are 3 solutions, which you will find by setting the 'ReturnConditions' option to true: syms x A alpha h2m syms b positiv...

Easily solved equation isn't being solved by 'solve'

There are 3 solutions, which you will find by setting the 'ReturnConditions' option to true: syms x A alpha h2m syms b positiv...

9 dagen ago | 1

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Answered

Undefined function 'ln' for input arguments of type 'double'. Sorry I kindly no idea what was wrong with the coding. Kindly help please ,Thanks a lots.

Change: F = inline('y*log(y))','x','y','z'); to: F = inline('y*log(y)','x','y','z'); also remove the error on the last line ...

Undefined function 'ln' for input arguments of type 'double'. Sorry I kindly no idea what was wrong with the coding. Kindly help please ,Thanks a lots.

Change: F = inline('y*log(y))','x','y','z'); to: F = inline('y*log(y)','x','y','z'); also remove the error on the last line ...

10 dagen ago | 0

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Answered

Nonlinear system of equations

https://de.mathworks.com/help/optim/ug/fsolve.html function myEq b1=1000; b2=100; c=50; t=0.76; T=950; n=5; x0 = [1 1 ...

Nonlinear system of equations

https://de.mathworks.com/help/optim/ug/fsolve.html function myEq b1=1000; b2=100; c=50; t=0.76; T=950; n=5; x0 = [1 1 ...

10 dagen ago | 1

| accepted

Answered

Error using GPU in Matlab 2020a for Reinforcement Learning

If you install Update 2 the problem should be solved: https://de.mathworks.com/support/bugreports/?release=R2020a&release_filte...

Error using GPU in Matlab 2020a for Reinforcement Learning

If you install Update 2 the problem should be solved: https://de.mathworks.com/support/bugreports/?release=R2020a&release_filte...

15 dagen ago | 2

| accepted

Submitted

ADX - Directional Movement System

Calculates values for Directional Movement System like J. Welles Wilder describes in his book 'New Concepts in Technical Trading...

29 dagen ago | 5 downloads |

Answered

How to remove 'e' from a matrix?

N(N<1e-8)=0; this will hard set all values smaller than 1e-8 to zero. >> format shorte >> N = [12, 0.24e-16, 9] N = ...

How to remove 'e' from a matrix?

N(N<1e-8)=0; this will hard set all values smaller than 1e-8 to zero. >> format shorte >> N = [12, 0.24e-16, 9] N = ...

ongeveer 2 maanden ago | 0

Answered

Solving System of 4 Non-Linear Equations

fsolve is a numerical solver - use vpasolve instead: syms A B C t0 eq1 = A*sin(2*B*pi*0.2 + 2*B*pi*(0 - t0)^2)+C - sin(2*pi*0....

Solving System of 4 Non-Linear Equations

fsolve is a numerical solver - use vpasolve instead: syms A B C t0 eq1 = A*sin(2*B*pi*0.2 + 2*B*pi*(0 - t0)^2)+C - sin(2*pi*0....

ongeveer 2 maanden ago | 0

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Answered

How to concatenate horizontaly and not vertically

use C = [C, RAIES]; V = [V, DATAS]; instead C = [C; RAIES]; V = [V; DATAS];

How to concatenate horizontaly and not vertically

use C = [C, RAIES]; V = [V, DATAS]; instead C = [C; RAIES]; V = [V; DATAS];

ongeveer 2 maanden ago | 1

| accepted

Answered

How to use ode45 to model malaria?

tspan = [0 100]; y0 = zeros(1,4); [T,Y] = ode45(@malariaSEIRS, tspan, y0); figure(1) plot(T,Y) grid legend('S', 'E', 'I'...

How to use ode45 to model malaria?

tspan = [0 100]; y0 = zeros(1,4); [T,Y] = ode45(@malariaSEIRS, tspan, y0); figure(1) plot(T,Y) grid legend('S', 'E', 'I'...

ongeveer 2 maanden ago | 0

Answered

Iam getting an error with the ODE45 function (line 90)and (line 115)?

clc clear y0=[0.01 0.5]; %enter the initial conditions. t0=[0 60] ; %enter the first and final time for the analysis. [t,x]=...

Iam getting an error with the ODE45 function (line 90)and (line 115)?

clc clear y0=[0.01 0.5]; %enter the initial conditions. t0=[0 60] ; %enter the first and final time for the analysis. [t,x]=...

ongeveer 2 maanden ago | 1

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Answered

insert zeros into vector

a = [1 2 3 4 5] b = zeros(4,numel(a)) result = reshape([a; b],1,[])

insert zeros into vector

a = [1 2 3 4 5] b = zeros(4,numel(a)) result = reshape([a; b],1,[])

ongeveer 2 maanden ago | 1

| accepted

Answered

I need help as soon as possible

Try to work with a table to make life easier: N=1:10; a=0;b=2;alp=0.5; f=@(t,y)y-t^2+1; yexact=@(y,t)(1+t).^2-0.5*exp(t); h...

I need help as soon as possible

Try to work with a table to make life easier: N=1:10; a=0;b=2;alp=0.5; f=@(t,y)y-t^2+1; yexact=@(y,t)(1+t).^2-0.5*exp(t); h...

2 maanden ago | 2

Answered

Convert two vectors (x and y) to a square matrix ?

x = 0:0.01:6.28; y = sin(x); M = ones(size(x,2)); x_int = 1:size(x,2); y_int = ceil(y * size(y,2)/(abs(min(y))+abs(max(y...

Convert two vectors (x and y) to a square matrix ?

x = 0:0.01:6.28; y = sin(x); M = ones(size(x,2)); x_int = 1:size(x,2); y_int = ceil(y * size(y,2)/(abs(min(y))+abs(max(y...

2 maanden ago | 1

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Answered

Fit to find the value of an unknown parameter

Try to optimize with least squares: A=0.1; B=0.5; C=100; % Range for H lb = 0.0001; ub = 0.05; best_H = fminbnd(@(H)s...

Fit to find the value of an unknown parameter

Try to optimize with least squares: A=0.1; B=0.5; C=100; % Range for H lb = 0.0001; ub = 0.05; best_H = fminbnd(@(H)s...

2 maanden ago | 0

| accepted

Answered

Describing the motion of a composite body using system of differential equations

Solve numeric: syms y(t) z(t) Dy = diff(y,t); Dz = diff(z,t); eqns = [diff(y,t,2) == (29.4*cos(z)+4*Dz*Dz)*sin(z)/(1+3*sin(...

Describing the motion of a composite body using system of differential equations

Solve numeric: syms y(t) z(t) Dy = diff(y,t); Dz = diff(z,t); eqns = [diff(y,t,2) == (29.4*cos(z)+4*Dz*Dz)*sin(z)/(1+3*sin(...

3 maanden ago | 0

| accepted