Alexander
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MEDIA DE ME GUSTA
Contribute at least one answer each month for 6 consecutive months
Awarded to Alexander on 20 Jul 2017
20 of your answers have been accepted
Awarded to Alexander on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Alexander on 20 Jul 2017
Solve a problem for the first time
Awarded to Alexander on 25 Jul 2012
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Resuelto
Arrange Vector in descending order
If x=[0,3,4,2,1] then y=[4,3,2,1,0]
alrededor de 2 años hace
I can use functions- "sym()" and "syms()".
The functions |sym| and |syms| are part of the Symbolic Math Toolbox. Are you sure that you have the Symbolic Math Toolbox insta...
más de 11 años hace | 0
Removing exponents from a sysm class term
You can use |evalin| to do a substitution of the powers inside MuPAD: >> evalin(symengine, ['subs(', char(answer) ,', hold(_...
alrededor de 12 años hace | 0
| aceptada
Calculating Fourier Series Coefficients Using Custom Matlab Function
You forgot the index for assigning to |ak|. Also do you want the indefinite integral or an integral from 0 to 2*pi/w0? I added t...
alrededor de 12 años hace | 0
Using latex command with anonymous functions
In R2012a I can do this: >> syms x y B(x) >> latex(B(x)) ans = B\!\left(x\right) >> latex(B(y)) ans = ...
más de 12 años hace | 1
Resuelto
Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...
más de 12 años hace
Resuelto
Determine if input is odd
Given the input n, return true if n is odd or false if n is even.
más de 12 años hace
Resuelto
Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...
más de 12 años hace
Resuelto
Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...
más de 12 años hace
Resuelto
Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...
más de 12 años hace
Solving a symbolic complex determinant by putting real and imaginary parts equal to zero??
Why do you split into real and imaginary part and solve both? I would expect this to work: S=solve(my_det, a1, a2) If I t...
más de 12 años hace | 0
Solve: Working only sometimes
Some of your variable get 'Inf' in between. If you want to use variable precision arithmetic, make sure you use syms. I get a re...
más de 12 años hace | 0
| aceptada
How can I find the coefficients of the symbolic variables in a linear equation?
Maybe the thread <http://www.mathworks.de/matlabcentral/answers/41348-isolate-coefficients-of-multivariate-linear-polynomial Iso...
más de 12 años hace | 0
| aceptada
Isolate Coefficients of Multivariate Linear Polynomial
If you know that you have only linear terms and only |x|, |r|, and |y|, you could use |diff| to get the coefficients: syms x...
más de 12 años hace | 0
| aceptada
How to symbolically differentiate a function with respect to a different function
It seems as if you cannot differentiate with respect to a symbolic function. Maybe it helps if you substitute phi_dot with a nor...
más de 12 años hace | 0
| aceptada
solve command
Seems to be the same problem as here: <http://www.mathworks.de/matlabcentral/answers/40281-substitution-after-differentiation-ea...
más de 12 años hace | 0
| aceptada
Matlab simplify boolean expression
You have copied a MuPAD command. Did you use it inside a MuPAD Notebook? If not, type this at the MATLAB command prompt: mup...
más de 12 años hace | 1
integration
Why do you think that the answer is incorrect? If you just want a number, use |double| on the result: >> double(H0) ...
más de 12 años hace | 3
Problem using subs in syms with matrix
The error raises in these lines: d=c(1); e=c(2); f=c(3); The variable |c| is a (1x1) sym and MATLAB cannot access the...
más de 12 años hace | 0
Substitute 3 variables in this symbolic equation
Maybe in this case the suggestion from Walter scales better: [X, Y, Z] = ndgrid(5:5:30, 1100:100:1500, 1:0.5:3); WnetF = m...
más de 12 años hace | 0
Matlab solve the integration in version 2008 but doesn't solve it in version 2011b
It seems that MuPAD gets confused by the assumptions. At the moment, |int| gives a huge result in piecewises. If you do the foll...
más de 12 años hace | 0
problem in this integration
Not sure what you want to do. Could it be, that you meant this: syms T T0 P b = 0.141;cp0 = 38.12;h0 = 1684;R= 8.314;Act_W...
más de 12 años hace | 0
solving nonlinear equations
I do get the following error message: Error using solve>processString (line 337) ' -0.0889=(-w^0.5*(w-1)^2*(w*(w+2)*sinh...
más de 12 años hace | 0
| aceptada
eval() returns NaN when my matrix gets really big.
Please try the following: double(vpa(evalin(symengine, ['subs(' char(X) ', T=' num2str(T) ')']))) This does the followin...
más de 12 años hace | 0
| aceptada
How to solve equation using math symbolic and get erfinv as output?
Hi Caio, If you have MATLAB R2012a you can simpliy use the <http://www.mathworks.com/help/toolbox/mupad/stdlib/assume.html as...
más de 12 años hace | 1
| aceptada
Error while converting a HUGE symbolic equation to double (question edited and simplified further)
Does this work? subs(subs(Wnet, x, 5:5:30)', y, 1100:100:1500) respectively subs(subs(SFC, x, 5:5:30)', y, 1100:100...
más de 12 años hace | 0
| aceptada
Golden Search Optimization Technique
I'm not familiar with the Golden Search algorithm, but it seems that you are overwritting |fx| by accident. If I remove those li...
más de 12 años hace | 1
| aceptada
Wrong integration result with R2011b
Both answers are correct. Let me quote Wikipedia's entry for <http://en.wikipedia.org/wiki/Constant_of_integration Constant of i...
más de 12 años hace | 0
| aceptada
Integration In Matlab
Just use |double|: syms r R1=sqrt(3)*(2*r.^2-1) R2=sqrt(3)*(2*r.^2-1) b = .7; S=2*pi*imag(int(exp(1i*b*R1)*...
más de 12 años hace | 0
| aceptada
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