syms t
mu=2500*(10^-4); %cm^2*V^-1 * s^-1
R = 0.318;
eta=377;% ohm
N=3.681; %refindex
Pavg=7;%W
Za=50;%ohm
g=100*(10^-6);%m
pi=3.14;
alpha= 8.5*(10^4); %m^-1
taul= 35*(10^-15); %s
tauc= 10*(10^-12); %s
W=100*(10^-6); %m
L=300*(10^-6); % m
Tlt=325*(10^-6); % m
V=25; %V
E=V./g;
vopt=375*(10^12); %Hz
e=1.602*(10^-19);
h=6.626*(10^-34);
I=0.90*(10^8);% i
t=linspace(-0.5*(10^-12),3.0*(10^-12),100);
n(t)=I.*exp(-2).*((1-R)./(sqrt(2.*pi).*h.*vopt)).*taul.*exp((-taul.^2)./(8.*tauc.^2)).*exp(-t./tauc).*(erf(sqrt(2).*t./taul – (sqrt(2).*taul)./(4.*tauc))+1);
tc = 10.*(10.^-12);
n0=10.^18
dt=80.*(10^-12);
G=n0.*exp((-t.*t)/(dt.*dt))
ode = diff(n,t) == (-n./tc) + G;
cond = n(0) == n0;
nSol(t)=dsolve(ode,cond);

It shows difference order N must be a positive integer. Error in third last line. How to solve this error?syms t
mu=2500*(10^-4); %cm^2*V^-1 * s^-1
R = 0.318;
eta=377;% ohm
N=3.681; %refindex
Pavg=7;%W
Za=50;%ohm
g=100*(10^-6);%m
pi=3.14;
alpha= 8.5*(10^4); %m^-1
taul= 35*(10^-15); %s
tauc= 10*(10^-12); %s
W=100*(10^-6); %m
L=300*(10^-6); % m
Tlt=325*(10^-6); % m
V=25; %V
E=V./g;
vopt=375*(10^12); %Hz
e=1.602*(10^-19);
h=6.626*(10^-34);
I=0.90*(10^8);% i
t=linspace(-0.5*(10^-12),3.0*(10^-12),100);
n(t)=I.*exp(-2).*((1-R)./(sqrt(2.*pi).*h.*vopt)).*taul.*exp((-taul.^2)./(8.*tauc.^2)).*exp(-t./tauc).*(erf(sqrt(2).*t./taul – (sqrt(2).*taul)./(4.*tauc))+1);
tc = 10.*(10.^-12);
n0=10.^18
dt=80.*(10^-12);
G=n0.*exp((-t.*t)/(dt.*dt))
ode = diff(n,t) == (-n./tc) + G;
cond = n(0) == n0;
nSol(t)=dsolve(ode,cond);

It shows difference order N must be a positive integer. Error in third last line. How to solve this error? syms t
mu=2500*(10^-4); %cm^2*V^-1 * s^-1
R = 0.318;
eta=377;% ohm
N=3.681; %refindex
Pavg=7;%W
Za=50;%ohm
g=100*(10^-6);%m
pi=3.14;
alpha= 8.5*(10^4); %m^-1
taul= 35*(10^-15); %s
tauc= 10*(10^-12); %s
W=100*(10^-6); %m
L=300*(10^-6); % m
Tlt=325*(10^-6); % m
V=25; %V
E=V./g;
vopt=375*(10^12); %Hz
e=1.602*(10^-19);
h=6.626*(10^-34);
I=0.90*(10^8);% i
t=linspace(-0.5*(10^-12),3.0*(10^-12),100);
n(t)=I.*exp(-2).*((1-R)./(sqrt(2.*pi).*h.*vopt)).*taul.*exp((-taul.^2)./(8.*tauc.^2)).*exp(-t./tauc).*(erf(sqrt(2).*t./taul – (sqrt(2).*taul)./(4.*tauc))+1);
tc = 10.*(10.^-12);
n0=10.^18
dt=80.*(10^-12);
G=n0.*exp((-t.*t)/(dt.*dt))
ode = diff(n,t) == (-n./tc) + G;
cond = n(0) == n0;
nSol(t)=dsolve(ode,cond);

It shows difference order N must be a positive integer. Error in third last line. How to solve this error? ode MATLAB Answers — New Questions

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Hi everyone,
I am experiencing a strange issue creating a Simulink quadrotor simulation environment for testing the stock PX4 flight controller. I am adapting the model from this Simulink PX4 example: Monitor and Tune PX4 Host Target Flight Controller with Simulink-Based Plant Model. However, instead of running the flight controller on PX4 by creating a custom Simulink controller, I want to use the stock PX4 flight controller.
At first I tried running PX4 using just "make px4_sitl none_iris" in a fresh PX4 installation, and then running the Simulink model. This kind of works – PX4 waits for connection from a simulator, and then connects when the plant model is run. However, it immediately experiences 14 pre-flight failures, which means it does not arm. It does not display all of these errors, but they seem to be related to the sensors + others not listed.
I found some errors in the original simulink-based plant model (the heartbeat signal is broadcasting that it is a submarine? But also does not seem to be necessary in the first place) as well as some incorrect units being published to MAVLink. Fixing these does not seem to help.
I found a python file that creates a dummy drone that is convincing enough for PX4 to connect to. The code is attached to this post in the dummy sim file. Running the above make command and then the sim convinces PX4 that everything is good to go and the commander arms. I created a new Simulink file that just populates HIL_GPS, HIL_SENSOR and HIL_STATE_QUATERNION with the same data from the python file (base values, random offsets, scale, etc.).
Running PX4 and connecting to this sim clears 9 of the 14 pre-flight failures. The remaining 5 are all connected to the sensor message – the flight controller claims it is receiving invalid or no data from the accelerometer, gyroscope, compass and barometer. An image of the error is attached below.

All of this information should be provided by the HIL_SENSOR message, which is fully populated in the Simulink file and sent over UDP/TCP the same way all the other MAVLink messages are being sent. Why the HIL_SENSOR data is specifically not working is beyond me. Same values in the python script seem to be fine. Also, every sensor is failing, so I doubt I have messed up one or two inputs in the Simulink bus assignment. Attahced below is an image of the HIL_SENSOR assignment. I have also attached the Simulink file (called MinimumViableModel) as well as necessary support scripts.

Any help would be appreciated! I hope I have attached everything necessary to reproduce the issue.Hi everyone,
I am experiencing a strange issue creating a Simulink quadrotor simulation environment for testing the stock PX4 flight controller. I am adapting the model from this Simulink PX4 example: Monitor and Tune PX4 Host Target Flight Controller with Simulink-Based Plant Model. However, instead of running the flight controller on PX4 by creating a custom Simulink controller, I want to use the stock PX4 flight controller.
At first I tried running PX4 using just "make px4_sitl none_iris" in a fresh PX4 installation, and then running the Simulink model. This kind of works – PX4 waits for connection from a simulator, and then connects when the plant model is run. However, it immediately experiences 14 pre-flight failures, which means it does not arm. It does not display all of these errors, but they seem to be related to the sensors + others not listed.
I found some errors in the original simulink-based plant model (the heartbeat signal is broadcasting that it is a submarine? But also does not seem to be necessary in the first place) as well as some incorrect units being published to MAVLink. Fixing these does not seem to help.
I found a python file that creates a dummy drone that is convincing enough for PX4 to connect to. The code is attached to this post in the dummy sim file. Running the above make command and then the sim convinces PX4 that everything is good to go and the commander arms. I created a new Simulink file that just populates HIL_GPS, HIL_SENSOR and HIL_STATE_QUATERNION with the same data from the python file (base values, random offsets, scale, etc.).
Running PX4 and connecting to this sim clears 9 of the 14 pre-flight failures. The remaining 5 are all connected to the sensor message – the flight controller claims it is receiving invalid or no data from the accelerometer, gyroscope, compass and barometer. An image of the error is attached below.

All of this information should be provided by the HIL_SENSOR message, which is fully populated in the Simulink file and sent over UDP/TCP the same way all the other MAVLink messages are being sent. Why the HIL_SENSOR data is specifically not working is beyond me. Same values in the python script seem to be fine. Also, every sensor is failing, so I doubt I have messed up one or two inputs in the Simulink bus assignment. Attahced below is an image of the HIL_SENSOR assignment. I have also attached the Simulink file (called MinimumViableModel) as well as necessary support scripts.

Any help would be appreciated! I hope I have attached everything necessary to reproduce the issue. Hi everyone,
I am experiencing a strange issue creating a Simulink quadrotor simulation environment for testing the stock PX4 flight controller. I am adapting the model from this Simulink PX4 example: Monitor and Tune PX4 Host Target Flight Controller with Simulink-Based Plant Model. However, instead of running the flight controller on PX4 by creating a custom Simulink controller, I want to use the stock PX4 flight controller.
At first I tried running PX4 using just "make px4_sitl none_iris" in a fresh PX4 installation, and then running the Simulink model. This kind of works – PX4 waits for connection from a simulator, and then connects when the plant model is run. However, it immediately experiences 14 pre-flight failures, which means it does not arm. It does not display all of these errors, but they seem to be related to the sensors + others not listed.
I found some errors in the original simulink-based plant model (the heartbeat signal is broadcasting that it is a submarine? But also does not seem to be necessary in the first place) as well as some incorrect units being published to MAVLink. Fixing these does not seem to help.
I found a python file that creates a dummy drone that is convincing enough for PX4 to connect to. The code is attached to this post in the dummy sim file. Running the above make command and then the sim convinces PX4 that everything is good to go and the commander arms. I created a new Simulink file that just populates HIL_GPS, HIL_SENSOR and HIL_STATE_QUATERNION with the same data from the python file (base values, random offsets, scale, etc.).
Running PX4 and connecting to this sim clears 9 of the 14 pre-flight failures. The remaining 5 are all connected to the sensor message – the flight controller claims it is receiving invalid or no data from the accelerometer, gyroscope, compass and barometer. An image of the error is attached below.

All of this information should be provided by the HIL_SENSOR message, which is fully populated in the Simulink file and sent over UDP/TCP the same way all the other MAVLink messages are being sent. Why the HIL_SENSOR data is specifically not working is beyond me. Same values in the python script seem to be fine. Also, every sensor is failing, so I doubt I have messed up one or two inputs in the Simulink bus assignment. Attahced below is an image of the HIL_SENSOR assignment. I have also attached the Simulink file (called MinimumViableModel) as well as necessary support scripts.

Any help would be appreciated! I hope I have attached everything necessary to reproduce the issue. simulink, sitl, software in the loop, px4, sensor data MATLAB Answers — New Questions

​

I have two large tables and they have the same column 1 and variables. The only thing different is the data. Now what i want to be able to do is to combine identical rows make a new chart were they all appear grouped. I want to then do a t test.I have two large tables and they have the same column 1 and variables. The only thing different is the data. Now what i want to be able to do is to combine identical rows make a new chart were they all appear grouped. I want to then do a t test. I have two large tables and they have the same column 1 and variables. The only thing different is the data. Now what i want to be able to do is to combine identical rows make a new chart were they all appear grouped. I want to then do a t test. tables MATLAB Answers — New Questions

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I have a cell array. Each cell contains an n by m cell. How can I get "m"?I have a cell array. Each cell contains an n by m cell. How can I get "m"? I have a cell array. Each cell contains an n by m cell. How can I get "m"? cell array MATLAB Answers — New Questions

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Hi i’m gonna open another discussion hoping more people will join it and someone will find the solution. I have a set of data which have been interpolated through Fourier Transform to build a function f(x)=A*cos(2*pi*F*x+P). All the coefficients have been succesfully calculated and the function fit perfectly the data. The problem is that when i try to plot the equation to further x value the function tends immediately to a stochastic behaviour (small amplitude-high frequency wave) which it doesn’t make any sense.
In other words after the interpolation period the function collapse immediately into its noise and strong amplitudes disappear.
Does anyone can solve this problem?
I attach the model.
Thanks for you all in advanceHi i’m gonna open another discussion hoping more people will join it and someone will find the solution. I have a set of data which have been interpolated through Fourier Transform to build a function f(x)=A*cos(2*pi*F*x+P). All the coefficients have been succesfully calculated and the function fit perfectly the data. The problem is that when i try to plot the equation to further x value the function tends immediately to a stochastic behaviour (small amplitude-high frequency wave) which it doesn’t make any sense.
In other words after the interpolation period the function collapse immediately into its noise and strong amplitudes disappear.
Does anyone can solve this problem?
I attach the model.
Thanks for you all in advance Hi i’m gonna open another discussion hoping more people will join it and someone will find the solution. I have a set of data which have been interpolated through Fourier Transform to build a function f(x)=A*cos(2*pi*F*x+P). All the coefficients have been succesfully calculated and the function fit perfectly the data. The problem is that when i try to plot the equation to further x value the function tends immediately to a stochastic behaviour (small amplitude-high frequency wave) which it doesn’t make any sense.
In other words after the interpolation period the function collapse immediately into its noise and strong amplitudes disappear.
Does anyone can solve this problem?
I attach the model.
Thanks for you all in advance fft, fourier, model, interpolation, amplitude, noise, function MATLAB Answers — New Questions

​

function [Kf_LMax] = Kf_Cal(Kf_Max, RLC, TauKf_ON, TauKf_OFF, PhaseTimes, t)
%compute the maximum Kf_L based on RLC values
Kf_LMax_values = Kf_Max * (RLC ./ (1 + RLC));
% Determine which phase each time step falls into
num_phases = numel(RLC);
phase_idx = zeros(size(t));
for j = 1:num_phases
T_start = PhaseTimes(j);
if j < num_phases
T_end = PhaseTimes(j + 1);
else
T_end = inf;
end
phase_idx(t >= T_start & t < T_end) = j;
end
% Calculate Kf_L for each time step based on the phase
Kf_LMax = zeros(size(t));
for i = 1:length(t)
j = phase_idx(i);
if j == 1
Kf_LMax(i) = Kf_LMax_values(j);
else
prev_end = PhaseTimes(j – 1);
if RLC(j – 1) < RLC(j)
Kf_LMax(i) = Kf_LMax_values(j) – (Kf_LMax_values(j) – Kf_LMax_values(j – 1)) * exp(TauKf_ON * (t(i) – prev_end));
else
Kf_LMax(i) = Kf_LMax_values(j) + (Kf_LMax_values(j) – Kf_LMax_values(j – 1)) * exp(TauKf_OFF * (t(i) – prev_end));
end
end
end
end

How i modifed this for loop so it get the last value Kf_LMax of previous iteration not from the computed values in bold before the loop?function [Kf_LMax] = Kf_Cal(Kf_Max, RLC, TauKf_ON, TauKf_OFF, PhaseTimes, t)
%compute the maximum Kf_L based on RLC values
Kf_LMax_values = Kf_Max * (RLC ./ (1 + RLC));
% Determine which phase each time step falls into
num_phases = numel(RLC);
phase_idx = zeros(size(t));
for j = 1:num_phases
T_start = PhaseTimes(j);
if j < num_phases
T_end = PhaseTimes(j + 1);
else
T_end = inf;
end
phase_idx(t >= T_start & t < T_end) = j;
end
% Calculate Kf_L for each time step based on the phase
Kf_LMax = zeros(size(t));
for i = 1:length(t)
j = phase_idx(i);
if j == 1
Kf_LMax(i) = Kf_LMax_values(j);
else
prev_end = PhaseTimes(j – 1);
if RLC(j – 1) < RLC(j)
Kf_LMax(i) = Kf_LMax_values(j) – (Kf_LMax_values(j) – Kf_LMax_values(j – 1)) * exp(TauKf_ON * (t(i) – prev_end));
else
Kf_LMax(i) = Kf_LMax_values(j) + (Kf_LMax_values(j) – Kf_LMax_values(j – 1)) * exp(TauKf_OFF * (t(i) – prev_end));
end
end
end
end

How i modifed this for loop so it get the last value Kf_LMax of previous iteration not from the computed values in bold before the loop? function [Kf_LMax] = Kf_Cal(Kf_Max, RLC, TauKf_ON, TauKf_OFF, PhaseTimes, t)
%compute the maximum Kf_L based on RLC values
Kf_LMax_values = Kf_Max * (RLC ./ (1 + RLC));
% Determine which phase each time step falls into
num_phases = numel(RLC);
phase_idx = zeros(size(t));
for j = 1:num_phases
T_start = PhaseTimes(j);
if j < num_phases
T_end = PhaseTimes(j + 1);
else
T_end = inf;
end
phase_idx(t >= T_start & t < T_end) = j;
end
% Calculate Kf_L for each time step based on the phase
Kf_LMax = zeros(size(t));
for i = 1:length(t)
j = phase_idx(i);
if j == 1
Kf_LMax(i) = Kf_LMax_values(j);
else
prev_end = PhaseTimes(j – 1);
if RLC(j – 1) < RLC(j)
Kf_LMax(i) = Kf_LMax_values(j) – (Kf_LMax_values(j) – Kf_LMax_values(j – 1)) * exp(TauKf_ON * (t(i) – prev_end));
else
Kf_LMax(i) = Kf_LMax_values(j) + (Kf_LMax_values(j) – Kf_LMax_values(j – 1)) * exp(TauKf_OFF * (t(i) – prev_end));
end
end
end
end

How i modifed this for loop so it get the last value Kf_LMax of previous iteration not from the computed values in bold before the loop? matlab code MATLAB Answers — New Questions

​

Hello,
We have a model running on our Speedgoat Unit real-time target machine. Our aim is to run the model at a smaller timestep, we are aiming for a timestep of 0.2ms. Currently, the timestep is 0.66667ms.
I have attached an image from the TET Monitor. As can be seen in the image, for the main model BaseRate (0.00066667s), the min/max TETs are 0.112ms/0.213ms.
I appreciate I cannot run the model at 0.2ms, because the maximum TET is 0.213ms. However, when I am viewing the TET during real time operation, it is always much closer to the minimum, i.e. it never goes above 0.15ms.
I guess it only reaches the maximum TET (0.213ms) when the model is starting up in the first few seconds. Is there any way to relax the real time requirement when the model is first loaded to the simulator? For example if the first second actually takes 10 seconds this is fine as long as it then starts running in real time after. Alternatively, is there any other way to deal with this?
ThanksHello,
We have a model running on our Speedgoat Unit real-time target machine. Our aim is to run the model at a smaller timestep, we are aiming for a timestep of 0.2ms. Currently, the timestep is 0.66667ms.
I have attached an image from the TET Monitor. As can be seen in the image, for the main model BaseRate (0.00066667s), the min/max TETs are 0.112ms/0.213ms.
I appreciate I cannot run the model at 0.2ms, because the maximum TET is 0.213ms. However, when I am viewing the TET during real time operation, it is always much closer to the minimum, i.e. it never goes above 0.15ms.
I guess it only reaches the maximum TET (0.213ms) when the model is starting up in the first few seconds. Is there any way to relax the real time requirement when the model is first loaded to the simulator? For example if the first second actually takes 10 seconds this is fine as long as it then starts running in real time after. Alternatively, is there any other way to deal with this?
Thanks Hello,
We have a model running on our Speedgoat Unit real-time target machine. Our aim is to run the model at a smaller timestep, we are aiming for a timestep of 0.2ms. Currently, the timestep is 0.66667ms.
I have attached an image from the TET Monitor. As can be seen in the image, for the main model BaseRate (0.00066667s), the min/max TETs are 0.112ms/0.213ms.
I appreciate I cannot run the model at 0.2ms, because the maximum TET is 0.213ms. However, when I am viewing the TET during real time operation, it is always much closer to the minimum, i.e. it never goes above 0.15ms.
I guess it only reaches the maximum TET (0.213ms) when the model is starting up in the first few seconds. Is there any way to relax the real time requirement when the model is first loaded to the simulator? For example if the first second actually takes 10 seconds this is fine as long as it then starts running in real time after. Alternatively, is there any other way to deal with this?
Thanks speedgoat, real-time simulation, task execution time MATLAB Answers — New Questions

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My matlab version is 2018b, and visual studio version is 2022.
I want matlab to detect the compiler integrated in the visual studio
(path:Microsoft Visual Studio2022CommunityVCToolsMSVC14.41.34120binHostx64x64cl.exe)
I tried to copy and modify the associated xml file, however, I found for the newest matlab, it is only support the oneAPI.
I don’t know how to modify the xml file, and I have not found something similar to solve this problem.

EDIT: I (Bruno) wrongly edit the question, sorryMy matlab version is 2018b, and visual studio version is 2022.
I want matlab to detect the compiler integrated in the visual studio
(path:Microsoft Visual Studio2022CommunityVCToolsMSVC14.41.34120binHostx64x64cl.exe)
I tried to copy and modify the associated xml file, however, I found for the newest matlab, it is only support the oneAPI.
I don’t know how to modify the xml file, and I have not found something similar to solve this problem.

EDIT: I (Bruno) wrongly edit the question, sorry My matlab version is 2018b, and visual studio version is 2022.
I want matlab to detect the compiler integrated in the visual studio
(path:Microsoft Visual Studio2022CommunityVCToolsMSVC14.41.34120binHostx64x64cl.exe)
I tried to copy and modify the associated xml file, however, I found for the newest matlab, it is only support the oneAPI.
I don’t know how to modify the xml file, and I have not found something similar to solve this problem.

EDIT: I (Bruno) wrongly edit the question, sorry mex compiler, visual studio 2022, matlab 2018b MATLAB Answers — New Questions

​

I want to print all the rows on the same line of array a and b. How would i be able to do that?
a = [12,3,4,5];
b= [4,5,12,3];
fprintf(‘a: %dnb: %d’,a, b)
Output:
a: 12
b: 3a: 4
b: 5a: 4
b: 5a: 12
b: 3
Expected output
a: [12,3,4,5]
b: [4,5,12,3]I want to print all the rows on the same line of array a and b. How would i be able to do that?
a = [12,3,4,5];
b= [4,5,12,3];
fprintf(‘a: %dnb: %d’,a, b)
Output:
a: 12
b: 3a: 4
b: 5a: 4
b: 5a: 12
b: 3
Expected output
a: [12,3,4,5]
b: [4,5,12,3] I want to print all the rows on the same line of array a and b. How would i be able to do that?
a = [12,3,4,5];
b= [4,5,12,3];
fprintf(‘a: %dnb: %d’,a, b)
Output:
a: 12
b: 3a: 4
b: 5a: 4
b: 5a: 12
b: 3
Expected output
a: [12,3,4,5]
b: [4,5,12,3] arrays, array, vector, fprintf MATLAB Answers — New Questions

​

Hello,
I’ve been trying for so long to set up the required addons to run my code in MATLAB GPU. I had to install and configure various addons for the same, one such is C++ compiler. I installed MinGW64 and placed it in varous locations in my computer and run the coder.checkGpuInstall(full). Matlab isn’t recognising MinGW 64 at all. I’ve also tried changing the directory address.
Someone please help me with it…Hello,
I’ve been trying for so long to set up the required addons to run my code in MATLAB GPU. I had to install and configure various addons for the same, one such is C++ compiler. I installed MinGW64 and placed it in varous locations in my computer and run the coder.checkGpuInstall(full). Matlab isn’t recognising MinGW 64 at all. I’ve also tried changing the directory address.
Someone please help me with it… Hello,
I’ve been trying for so long to set up the required addons to run my code in MATLAB GPU. I had to install and configure various addons for the same, one such is C++ compiler. I installed MinGW64 and placed it in varous locations in my computer and run the coder.checkGpuInstall(full). Matlab isn’t recognising MinGW 64 at all. I’ve also tried changing the directory address.
Someone please help me with it… c++, mingw, gpu MATLAB Answers — New Questions

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