Alan Stevens
Contribute at least one answer each month for 36 consecutive months
Awarded to Alan Stevens on 02 May 2023
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Awarded to Alan Stevens on 06 Sep 2020
Provide your first answer ever to someone else's question
Awarded to Alan Stevens on 25 May 2020
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已回答
How to plot all figures in only one plot?
Here's one simple way: x=-pi:0.1:pi; c=-6:5; figure hold on for i=1:length(c) y=c(i)*x.^(2)+4*x+2; plot(x,y) end...
How to plot all figures in only one plot?
Here's one simple way: x=-pi:0.1:pi; c=-6:5; figure hold on for i=1:length(c) y=c(i)*x.^(2)+4*x+2; plot(x,y) end...
29 days 前 | 0
| 已接受
已回答
Error in Hermite Polynomial
In line for j = 0:i-1 you have j starting at zero. Matlab's indices start at 1, so the following line should have X(j+1) not ...
Error in Hermite Polynomial
In line for j = 0:i-1 you have j starting at zero. Matlab's indices start at 1, so the following line should have X(j+1) not ...
1 month 前 | 0
已回答
Matlab code not computing
The use of square brackets in the scatter function is not the only problem! Are you looking for something like this? p=-1; z=...
Matlab code not computing
The use of square brackets in the scatter function is not the only problem! Are you looking for something like this? p=-1; z=...
2 months 前 | 0
| 已接受
已回答
how to plot the path of circular beam oscillation welding?
Like this? A=1; f=50; vf=0.02; time = linspace(0,100,500); x0 = vf*time; theta = 2*pi*f*time; x=A*cos(theta)+x0; y=A*sin...
how to plot the path of circular beam oscillation welding?
Like this? A=1; f=50; vf=0.02; time = linspace(0,100,500); x0 = vf*time; theta = 2*pi*f*time; x=A*cos(theta)+x0; y=A*sin...
2 months 前 | 0
已回答
how to change the direction of the airfoil
Change contourf(real(J),imag(J),imag(f),v2); %%%%% fill(real(zair),imag(zair),'k') to contourf(-real(J),imag(J),imag(f),v2);...
how to change the direction of the airfoil
Change contourf(real(J),imag(J),imag(f),v2); %%%%% fill(real(zair),imag(zair),'k') to contourf(-real(J),imag(J),imag(f),v2);...
3 months 前 | 0
| 已接受
已回答
How to use 5 function coupled each other using ODE45? it is possible?
Better like this: MM0 = [10, 0, 0, 0, 0]; tspan = [0 100]; [t, MM] = ode15s(@mymode, tspan,MM0); M1 = MM(:,1); M2 = MM(:...
How to use 5 function coupled each other using ODE45? it is possible?
Better like this: MM0 = [10, 0, 0, 0, 0]; tspan = [0 100]; [t, MM] = ode15s(@mymode, tspan,MM0); M1 = MM(:,1); M2 = MM(:...
3 months 前 | 0
| 已接受
已回答
convert a column matrix with many rows into multiple column of equal rows
Try the reshape function.
convert a column matrix with many rows into multiple column of equal rows
Try the reshape function.
3 months 前 | 0
已回答
"Not enough Imput arguments" ERROR
You haven't included J as an input argument to function Feedback_Ven_STEP.
"Not enough Imput arguments" ERROR
You haven't included J as an input argument to function Feedback_Ven_STEP.
3 months 前 | 0
| 已接受
已回答
Using polyfit in two arrays to detrend data.
polyfit just returns the coefficients of the polynomial. You need to use them in polyval to calculate data values.
Using polyfit in two arrays to detrend data.
polyfit just returns the coefficients of the polynomial. You need to use them in polyval to calculate data values.
3 months 前 | 2
已回答
Implicit solution using pdepe 1D advection diffusion reaction equation
I think you've overcomplicated the situation! Should be more like the following (which you should check very carefully, as I di...
Implicit solution using pdepe 1D advection diffusion reaction equation
I think you've overcomplicated the situation! Should be more like the following (which you should check very carefully, as I di...
3 months 前 | 0
已回答
I want to plot the vector field on F=x i+ j
Do you mean like this? [x,y] = meshgrid(-3:.15:3,-3:.15:3); Fx = x; Fy = ones(size(y)); %%%%%%%%%%% figure; quiver(x,y,Fx,F...
I want to plot the vector field on F=x i+ j
Do you mean like this? [x,y] = meshgrid(-3:.15:3,-3:.15:3); Fx = x; Fy = ones(size(y)); %%%%%%%%%%% figure; quiver(x,y,Fx,F...
3 months 前 | 0
| 已接受
已回答
i have two set of data for temperature measurements which vary depends on each other. the variation may be divided into three portions. how can we seperate these portions
Here's a possible way (assumes the data is already in the workspace): dT2 = gradient(T2); minval = min(dT2(Time<2.5)); ix = f...
i have two set of data for temperature measurements which vary depends on each other. the variation may be divided into three portions. how can we seperate these portions
Here's a possible way (assumes the data is already in the workspace): dT2 = gradient(T2); minval = min(dT2(Time<2.5)); ix = f...
3 months 前 | 0
已回答
whats preventing my code from generating the proper results
I don't know anythng about the physics of your scenario, but are you sure you are calculating NLOS_LOWER_BOUND correctly? The f...
whats preventing my code from generating the proper results
I don't know anythng about the physics of your scenario, but are you sure you are calculating NLOS_LOWER_BOUND correctly? The f...
3 months 前 | 0
已回答
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): % ...
3 months 前 | 0
| 已接受
已回答
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)...
3 months 前 | 1
| 已接受
已回答
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...
4 months 前 | 0
| 已接受
已回答
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 ...
4 months 前 | 0
已回答
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; ...
4 months 前 | 1
| 已接受
已回答
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...
4 months 前 | 0
已回答
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...
4 months 前 | 0
已回答
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)?
5 months 前 | 0
已回答
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
5 months 前 | 0
已回答
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) ...
5 months 前 | 0
已回答
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...
5 months 前 | 0
已回答
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...
5 months 前 | 1
| 已接受
已回答
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...
5 months 前 | 0
已回答
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')
5 months 前 | 0
已回答
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).
5 months 前 | 0
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