Answered
using ode45 to solve 3 ODEs with solar radiation
Hi Hasan, based on the error message I suggest looking into tdot at the bottom of your ode function. Apparently, this is a 17x1...
using ode45 to solve 3 ODEs with solar radiation
Hi Hasan, based on the error message I suggest looking into tdot at the bottom of your ode function. Apparently, this is a 17x1...
3 years ago | 1
Answered
How to plot with 3 inputs but 2 are steady?
Hi Niklas, use fx = zeros(size(x)); fy = zeros(size(x)); fz = x+1;
How to plot with 3 inputs but 2 are steady?
Hi Niklas, use fx = zeros(size(x)); fy = zeros(size(x)); fz = x+1;
3 years ago | 1
| accepted
Answered
Logical function not returning correct value for smaller numbers
Hi Ravi, try something like if abs(Vektor(k) - x) < tol and use tol to fine-tune your algorithm depending on how "different" y...
Logical function not returning correct value for smaller numbers
Hi Ravi, try something like if abs(Vektor(k) - x) < tol and use tol to fine-tune your algorithm depending on how "different" y...
3 years ago | 1
| accepted
Answered
Simulating a free-fall project with ode45
Hallo Lukas, The height is the first component of the state vector. I'll just call the state vector X is in the code below. So ...
Simulating a free-fall project with ode45
Hallo Lukas, The height is the first component of the state vector. I'll just call the state vector X is in the code below. So ...
3 years ago | 0
Answered
control inner positions of ui axes in app designer
Hi Peng, with release 2020b you can keep plot axes aligned in App Designer. Do the following: Align all plot axes in the App De...
control inner positions of ui axes in app designer
Hi Peng, with release 2020b you can keep plot axes aligned in App Designer. Do the following: Align all plot axes in the App De...
3 years ago | 0
Answered
Splitting a matrix into submatrices by value
Something like this? A = [2 3 0 3;... 3 2 1 3;... 2 2 1 2] A = 2 3 0 3 3 2 ...
Splitting a matrix into submatrices by value
Something like this? A = [2 3 0 3;... 3 2 1 3;... 2 2 1 2] A = 2 3 0 3 3 2 ...
5 years ago | 1
| accepted
Answered
How can I solve this transcendental equation graphically?
Timaway, define a vector |Xi|, e.g. using the |linspace| command. Then plot |tan(Xi)| and the right side of your equation into t...
How can I solve this transcendental equation graphically?
Timaway, define a vector |Xi|, e.g. using the |linspace| command. Then plot |tan(Xi)| and the right side of your equation into t...
5 years ago | 0
| accepted
Answered
Converting Matlab code and graphs into Latex
Hi Muhammad, there are a couple of packages on File Exchange, e.g. <https://de.mathworks.com/matlabcentral/fileexchange/8015-m-c...
Converting Matlab code and graphs into Latex
Hi Muhammad, there are a couple of packages on File Exchange, e.g. <https://de.mathworks.com/matlabcentral/fileexchange/8015-m-c...
5 years ago | 0
Answered
solving a second order linear differential equation
Almost there: g = 9.8; l = 0.5; t_span = [0 30]; teta0 = deg2rad(60); tetad0 = 0; F = @(t,q) [q(2);-(g/l...
solving a second order linear differential equation
Almost there: g = 9.8; l = 0.5; t_span = [0 30]; teta0 = deg2rad(60); tetad0 = 0; F = @(t,q) [q(2);-(g/l...
5 years ago | 0
| accepted
Answered
how to plot the phase portraits of a onlinear dynamics of rock-paper-scissors game model
Hi Cui, there are two steps you need to take to get to your desired result: # Solve the differential equations (DE): Essentia...
how to plot the phase portraits of a onlinear dynamics of rock-paper-scissors game model
Hi Cui, there are two steps you need to take to get to your desired result: # Solve the differential equations (DE): Essentia...
5 years ago | 0
| accepted
Answered
matlab giving complex number when the expected answer is a real number?
Note: >> (-1)^1.5 ans = 0.0000 - 1.0000i which is not the same as >> -1^1.5 % = -(1^1.5) ans = -1
matlab giving complex number when the expected answer is a real number?
Note: >> (-1)^1.5 ans = 0.0000 - 1.0000i which is not the same as >> -1^1.5 % = -(1^1.5) ans = -1
6 years ago | 2
| accepted
Answered
Why don't i get a vector for phi1?
All constants need to be defined. Then use: t = pi/2:0.01:2*pi+(pi/2); phi1 = (a^2+a^2+d^2+2*a*d*cos(pi-t)-d^2)./(2*b*...
Why don't i get a vector for phi1?
All constants need to be defined. Then use: t = pi/2:0.01:2*pi+(pi/2); phi1 = (a^2+a^2+d^2+2*a*d*cos(pi-t)-d^2)./(2*b*...
6 years ago | 0
| accepted
Answered
How do I display individual values from an if statement in a messgae?
Hi Matthew, I assume you are using a loop to do the iterations, most likely a |while| loop. If you say you can print only all th...
How do I display individual values from an if statement in a messgae?
Hi Matthew, I assume you are using a loop to do the iterations, most likely a |while| loop. If you say you can print only all th...
6 years ago | 0
| accepted
Submitted
RLC circuit demo bundle
Analyze the RLC series circuit using different modeling approaches and with hardware
6 years ago | 22 downloads |
Answered
WHY do I get this error
mahesh, is the above code all in one and the same script? If it is modify like this: [t,y]= ode45(@free25,[0 10],[0 0.09]);%...
WHY do I get this error
mahesh, is the above code all in one and the same script? If it is modify like this: [t,y]= ode45(@free25,[0 10],[0 0.09]);%...
6 years ago | 0
| accepted
Answered
Error in Matlab Fundamentals, 6.1 Project Review
Adam, thanks for bringing this to our attention. I will forward your information internally and make sure it is addressed as...
Error in Matlab Fundamentals, 6.1 Project Review
Adam, thanks for bringing this to our attention. I will forward your information internally and make sure it is addressed as...
6 years ago | 0
Answered
How do I count how many iterations my root is in a smaller interval?
In each iteration you have two intervals, |[a,c]| and |[c,b]|. Compute the size of both intervals and use the last |if-else| con...
How do I count how many iterations my root is in a smaller interval?
In each iteration you have two intervals, |[a,c]| and |[c,b]|. Compute the size of both intervals and use the last |if-else| con...
6 years ago | 0
| accepted
Answered
i need to find variable x and the error is " Undefined function or variable 'x'. "
A couple of things. In the code you show |Ei| is not defined and it looks like you need to solve the equation for different |a|....
i need to find variable x and the error is " Undefined function or variable 'x'. "
A couple of things. In the code you show |Ei| is not defined and it looks like you need to solve the equation for different |a|....
6 years ago | 1
| accepted
Answered
Help with error and coding.
One thing I noticed is the following: in your second while-loop you have while k<=24 x_c(k+1)=dist(k)*cosd(hr_deg(de...
Help with error and coding.
One thing I noticed is the following: in your second while-loop you have while k<=24 x_c(k+1)=dist(k)*cosd(hr_deg(de...
6 years ago | 0
Answered
Function Generation Error (Not enough input arguments)
Store the function in a file called |deneme.m| and then execute in the MATLAB command window y = deneme(3)
Function Generation Error (Not enough input arguments)
Store the function in a file called |deneme.m| and then execute in the MATLAB command window y = deneme(3)
6 years ago | 0
| accepted
Answered
Error RungeKutta method......not enough input arguments
Store |runKut4| and |fex7_4| in separate m-files and then execute [x,y] = runKut4(@fex7_4,0,[0 1],2,0.25); e.g. in the MA...
Error RungeKutta method......not enough input arguments
Store |runKut4| and |fex7_4| in separate m-files and then execute [x,y] = runKut4(@fex7_4,0,[0 1],2,0.25); e.g. in the MA...
6 years ago | 0
| accepted
Answered
How do I insert a column with zeros in the second column of a mxn matrix?
Brute force: A = [1 2 3; 4 5 6; 7 8 9] A = [zeros(size(A,1),1) A]; A(:,[1 2]) = A(:,[2 1])
How do I insert a column with zeros in the second column of a mxn matrix?
Brute force: A = [1 2 3; 4 5 6; 7 8 9] A = [zeros(size(A,1),1) A]; A(:,[1 2]) = A(:,[2 1])
6 years ago | 1
| accepted
Answered
Is it possible that we can save .m file results with different name each time of execution?
@km, take a look at the documentation <https://www.mathworks.com/help/matlab/import_export/writing-to-text-data-files-with-low-l...
Is it possible that we can save .m file results with different name each time of execution?
@km, take a look at the documentation <https://www.mathworks.com/help/matlab/import_export/writing-to-text-data-files-with-low-l...
6 years ago | 0
Answered
Plot multiple subintervals in one figure
Joakim, is this what you had in mind? f=@(t,u)-u+sin(5*t)+cos(2*t); a=0; b=5; ua=2; % begynnelsevillkor t=linspace(...
Plot multiple subintervals in one figure
Joakim, is this what you had in mind? f=@(t,u)-u+sin(5*t)+cos(2*t); a=0; b=5; ua=2; % begynnelsevillkor t=linspace(...
6 years ago | 0
| accepted
Answered
eval([ans '=' num2str(x0(i)) ';']); gives an error "The expression to the left of the equals sign is not a valid target for an assignment". what could be the problem?
Just wondering if the following would do the trick... eval('ans = num2str(x0(i));')
eval([ans '=' num2str(x0(i)) ';']); gives an error "The expression to the left of the equals sign is not a valid target for an assignment". what could be the problem?
Just wondering if the following would do the trick... eval('ans = num2str(x0(i));')
6 years ago | 0
Answered
Is there a way to solve a system of ordinary differential equation with different time scale by using ode solver?
Ram, it sounds like you are referring to solving (possibly) stiff ODE. If you do, yes, there are solvers. See the <https://www.m...
Is there a way to solve a system of ordinary differential equation with different time scale by using ode solver?
Ram, it sounds like you are referring to solving (possibly) stiff ODE. If you do, yes, there are solvers. See the <https://www.m...
6 years ago | 0
Answered
how to find min or max value in each row of a matrix and its index, if a matrix is 3x2 it will find the min in first row
Use [val,loc] = min(R') val = 21 35 42 % min value in each row loc = 3 1 1 % column locati...
how to find min or max value in each row of a matrix and its index, if a matrix is 3x2 it will find the min in first row
Use [val,loc] = min(R') val = 21 35 42 % min value in each row loc = 3 1 1 % column locati...
6 years ago | 11
| accepted
Answered
Multiplication between 2 matrix
Danilo, use the Symbolic Math Toolbox syms B C a b c d A = [1 0; 2 3]; B = [a b; c d]; C = A*B C = [ a, ...
Multiplication between 2 matrix
Danilo, use the Symbolic Math Toolbox syms B C a b c d A = [1 0; 2 3]; B = [a b; c d]; C = A*B C = [ a, ...
6 years ago | 0
| accepted
Answered
Can't figure out what's wrong with my code
Kevin, I see two problems with your algorithm/function |f(x)|: if f(xr)*f(xl)>0 needs to be if f(xr)*f(xl)<0 and ...
Can't figure out what's wrong with my code
Kevin, I see two problems with your algorithm/function |f(x)|: if f(xr)*f(xl)>0 needs to be if f(xr)*f(xl)<0 and ...
6 years ago | 0