Answered

Finding the optimal solution for a data with two variables

Here's a possible approach (I've used relative errors as the values of the two columns are an order of magnitude different): % ...

Finding the optimal solution for a data with two variables

Here's a possible approach (I've used relative errors as the values of the two columns are an order of magnitude different): % ...

1 year ago | 0

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Answered

Using loop to sum value of an array and summation

Here's one way: J=[1 2 3 4 5 6 1 2 3 4 5 6]; step = 3; ix = 1:step:numel(J); for i = 1:numel(ix) p(i) = sum(J(ix(i)...

Using loop to sum value of an array and summation

Here's one way: J=[1 2 3 4 5 6 1 2 3 4 5 6]; step = 3; ix = 1:step:numel(J); for i = 1:numel(ix) p(i) = sum(J(ix(i)...

1 year ago | 1

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Answered

Solving a system of inequalities using an eigenfunction and if, else.

Your function needs to be more like this, for example. Set values of x outside the function, call the function with these value...

Solving a system of inequalities using an eigenfunction and if, else.

Your function needs to be more like this, for example. Set values of x outside the function, call the function with these value...

1 year ago | 0

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Answered

Почему появилась ошибка?

Seems overcomplicated for a numerical solution! How about simply f = @(x) x - 5 - 1/3*cos(2*x+1) + 2*x./(2+x.^2); g = @(x) x ...

Почему появилась ошибка?

Seems overcomplicated for a numerical solution! How about simply f = @(x) x - 5 - 1/3*cos(2*x+1) + 2*x./(2+x.^2); g = @(x) x ...

1 year ago | 0

Answered

How to write 2D heat conduction exact solution for Inf n?

Your term sinh(n*pi*x/L) should be sin(n*pi*x/L). See the following code (which can be made more efficient!): L = 1; H = 2; ...

How to write 2D heat conduction exact solution for Inf n?

Your term sinh(n*pi*x/L) should be sin(n*pi*x/L). See the following code (which can be made more efficient!): L = 1; H = 2; ...

1 year ago | 1

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Answered

Help with Riccati equation

You haven't defined B (in the function definition)

Help with Riccati equation

You haven't defined B (in the function definition)

1 year ago | 0

Answered

How to create a time function and make a line rotate at a certain angular speed?

Do you mean something like this? r2_length = 2; tend = 10; % s dt = 0.1; t = 0:dt:tend; omega = 1; % rad/s theta = omega*t...

How to create a time function and make a line rotate at a certain angular speed?

Do you mean something like this? r2_length = 2; tend = 10; % s dt = 0.1; t = 0:dt:tend; omega = 1; % rad/s theta = omega*t...

1 year ago | 0

Answered

Cannot get integral function to work for two limits

Try this %Enthalpy datum conditions (Kelvin) Ti=(25+273.15); %Input temperature (Kelvin) T1=(183+273.15); %Output tem...

Cannot get integral function to work for two limits

Try this %Enthalpy datum conditions (Kelvin) Ti=(25+273.15); %Input temperature (Kelvin) T1=(183+273.15); %Output tem...

1 year ago | 0

Answered

I have some errors in executing the following code, can anyone help me please?

You have no initial guesses for y(5) and y(7). And what about y(6)?

I have some errors in executing the following code, can anyone help me please?

You have no initial guesses for y(5) and y(7). And what about y(6)?

1 year ago | 0

Answered

How can I plot a diagram with 12-15 different colors

Specify the colors with RGB triplets. doc Color

How can I plot a diagram with 12-15 different colors

Specify the colors with RGB triplets. doc Color

1 year ago | 0

Answered

This code give me an error of Index exceeds array bounds.

More like this? m=60; g=9.81; k=80; m_2=10; m_1=15; h=100; w=15; t=1:10:100; x = zeros(1,numel(t)); for i=1:numel(t) ...

This code give me an error of Index exceeds array bounds.

More like this? m=60; g=9.81; k=80; m_2=10; m_1=15; h=100; w=15; t=1:10:100; x = zeros(1,numel(t)); for i=1:numel(t) ...

1 year ago | 0

Answered

Why does MATLAB grader refuses to get my answer with the double integral evaluation problem?

As follows Oops! I did the sum incorrectly! Should have been like this: % box side length delta = 0.01; % mid box points...

Why does MATLAB grader refuses to get my answer with the double integral evaluation problem?

As follows Oops! I did the sum incorrectly! Should have been like this: % box side length delta = 0.01; % mid box points...

1 year ago | 0

Answered

initial condition vector longer than ODE vector?

Do it like this: a=2; b=5; % v0 is now set to 10 v0=10; % Using a,b to determine rest of variables R=10*a; C=0.0001...

initial condition vector longer than ODE vector?

Do it like this: a=2; b=5; % v0 is now set to 10 v0=10; % Using a,b to determine rest of variables R=10*a; C=0.0001...

1 year ago | 1

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Answered

Can some one fix this code? I am unable to understand this code? Though fixing one problem another problem is arising ! please help!

In the following line: G = (randn(Np,Mtot)+1j*randn(Np,Mtot))/sqrt(2); % When i=1, G is 1x20, but H is 20x2 so the following l...

Can some one fix this code? I am unable to understand this code? Though fixing one problem another problem is arising ! please help!

In the following line: G = (randn(Np,Mtot)+1j*randn(Np,Mtot))/sqrt(2); % When i=1, G is 1x20, but H is 20x2 so the following l...

1 year ago | 0

Answered

Connect all dots I polarplot

Like this? r=[10:36:360 10]; r = r/360*2*pi; s=[5,3.5,5,4,4,3.5,4,4.2,4.7,4, 5]; polarplot(r,s,'-x')

Connect all dots I polarplot

Like this? r=[10:36:360 10]; r = r/360*2*pi; s=[5,3.5,5,4,4,3.5,4,4.2,4.7,4, 5]; polarplot(r,s,'-x')

1 year ago | 0

Answered

I dont understand this error in line 653 and the end goal is to make a graph

Get rid of the gaps between Consibio and Cloud, and between Cloud and Datalog (In the file name and when calling it).

I dont understand this error in line 653 and the end goal is to make a graph

Get rid of the gaps between Consibio and Cloud, and between Cloud and Datalog (In the file name and when calling it).

1 year ago | 0

Answered

How can I solve the following PDE?

Try setting tau = T - t, so that dA/dt = -dA/dtau etc, and A(T) , B(T) become A(0), B(0). i.e. turn the boundary value problem ...

How can I solve the following PDE?

Try setting tau = T - t, so that dA/dt = -dA/dtau etc, and A(T) , B(T) become A(0), B(0). i.e. turn the boundary value problem ...

1 year ago | 0

Answered

how to use ode45 to solve motion equation with Matrix

Does this help? %% Data M =[ 0.0210 0.0014 -0.0209 0 0 0 0 0 0.0014 ...

how to use ode45 to solve motion equation with Matrix

Does this help? %% Data M =[ 0.0210 0.0014 -0.0209 0 0 0 0 0 0.0014 ...

1 year ago | 1

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Answered

Subscript indices must either be real positive integers or logicals always show up. what should i do?

Well, this works, but you might want to check the correctness or otherwise of your mode_shape calculations (there are a lot of z...

Subscript indices must either be real positive integers or logicals always show up. what should i do?

Well, this works, but you might want to check the correctness or otherwise of your mode_shape calculations (there are a lot of z...

1 year ago | 1

Answered

incorrect number or types of inputs or outputs for function 'int'

Replace your power calculation with power = (1/T_0) * trapz(t,y.^2); Edited - Walter is correct.

incorrect number or types of inputs or outputs for function 'int'

Replace your power calculation with power = (1/T_0) * trapz(t,y.^2); Edited - Walter is correct.

1 year ago | 0

Answered

Regula-falsi Method that keeps running

Brackets!! f = @(x) 2.^x - x.^2 - 2; % Function whose roots are desired xL = 4; xU = 5; % Initial guesses Tol = 1...

Regula-falsi Method that keeps running

Brackets!! f = @(x) 2.^x - x.^2 - 2; % Function whose roots are desired xL = 4; xU = 5; % Initial guesses Tol = 1...

1 year ago | 0

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Answered

Trying to answer a math problem using newton's method but having problem in the function.

Matlab doesn't like implied multiplication (x ^ 2)z should be (x ^ 2)*z etc. Also, in Matlab log(x) is ln(x)

Trying to answer a math problem using newton's method but having problem in the function.

Matlab doesn't like implied multiplication (x ^ 2)z should be (x ^ 2)*z etc. Also, in Matlab log(x) is ln(x)

1 year ago | 0

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Answered

How to set multiple values of a threshold?

Here's one way: tolX1_4 = [1 1 1 1 1 -1 1 1 0 1 1 1 1 1 1 1 1 ...

How to set multiple values of a threshold?

Here's one way: tolX1_4 = [1 1 1 1 1 -1 1 1 0 1 1 1 1 1 1 1 1 ...

1 year ago | 0

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Answered

Please help solve a system of differential equation

Here's a numerical approach: First manipulate the equations tspan = [0, 120]; ic = [80000, 0.001]; [t, xy] = ode45(@rate, ...

Please help solve a system of differential equation

Here's a numerical approach: First manipulate the equations tspan = [0, 120]; ic = [80000, 0.001]; [t, xy] = ode45(@rate, ...

1 year ago | 0

Answered

how ode solver works

doc ode45 Go to the References section. The two references listed will supply you with all you need to know about the ode solv...

how ode solver works

doc ode45 Go to the References section. The two references listed will supply you with all you need to know about the ode solv...

1 year ago | 0

Answered

Solve Differential Equation with initial conditions and function

Try modifying your if statement in Moment. Something like if x<a V =...; M = ...; elseif x>=a && x<L M = ... ...

Solve Differential Equation with initial conditions and function

Try modifying your if statement in Moment. Something like if x<a V =...; M = ...; elseif x>=a && x<L M = ... ...

1 year ago | 0

Answered

problem in creating function file using ode45

Are you looking for something like this? (I might have misinterpreted your equations!) O=1; a=pi/2; g=9.81; L=100; tspan ...

problem in creating function file using ode45

Are you looking for something like this? (I might have misinterpreted your equations!) O=1; a=pi/2; g=9.81; L=100; tspan ...

1 year ago | 0

Answered

how can eliminate negative data in erf function?

Should term2(i) = (sqrt(lemdaD)./(2.*e1(i))).*exp(-(v1(i).*sqrt_avgsnr - v2(i).* mu).^2./(2.*e1(i).^2)).*.... erf((e4(...

how can eliminate negative data in erf function?

Should term2(i) = (sqrt(lemdaD)./(2.*e1(i))).*exp(-(v1(i).*sqrt_avgsnr - v2(i).* mu).^2./(2.*e1(i).^2)).*.... erf((e4(...

1 year ago | 0

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Answered

Why is my plot not showing for improved Euler method?

You need to keep track of each step. Your original simply overwrites the values of t and y at each step. dy=@(t,y) -(0.1/10^(1...

Why is my plot not showing for improved Euler method?

You need to keep track of each step. Your original simply overwrites the values of t and y at each step. dy=@(t,y) -(0.1/10^(1...

1 year ago | 1

Answered

Why I couldn't plot this graph f=(@(x,y) (x.^2)+(x*y)+(y.^2)<=68200.^2/3);

This will give you the outline (I've assumed you want 68200^(2/3) rather than 68200^2/3) f=@(x,y) x.^2+x.*y+y.^2-68200.^(2/3); ...

Why I couldn't plot this graph f=(@(x,y) (x.^2)+(x*y)+(y.^2)<=68200.^2/3);

This will give you the outline (I've assumed you want 68200^(2/3) rather than 68200^2/3) f=@(x,y) x.^2+x.*y+y.^2-68200.^(2/3); ...

1 year ago | 0