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Contribute at least one answer each month for 6 consecutive months
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Feeds
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...
11 years ago | 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(_...
12 years ago | 0
| accepted
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...
12 years ago | 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 = ...
12 years ago | 1
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...
12 years ago | 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...
12 years ago | 0
| accepted
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...
12 years ago | 0
| accepted
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...
12 years ago | 0
| accepted
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...
12 years ago | 0
| accepted
solve command
Seems to be the same problem as here: <http://www.mathworks.de/matlabcentral/answers/40281-substitution-after-differentiation-ea...
12 years ago | 0
| accepted
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...
12 years ago | 1
integration
Why do you think that the answer is incorrect? If you just want a number, use |double| on the result: >> double(H0) ...
12 years ago | 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...
12 years ago | 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...
12 years ago | 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...
12 years ago | 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...
12 years ago | 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...
12 years ago | 0
| accepted
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...
12 years ago | 0
| accepted
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...
12 years ago | 1
| accepted
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...
12 years ago | 0
| accepted
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...
12 years ago | 1
| accepted
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...
12 years ago | 0
| accepted
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)*...
12 years ago | 0
| accepted
common multiplicity.or I can't obtain results.
If you have MATLAB R2012a you can use <http://www.mathworks.com/help/toolbox/symbolic/assume.html assume> and <http://www.mathwo...
12 years ago | 0
| accepted
loop with fzero
This works for me, if I set all variables to numbers: tauA1 = zeros(9, 1); tauA2 = zeros(9, 1); alpha=1; beta=2; gamma=3; p...
12 years ago | 1
| accepted
Trouble substituting a value into a symbolic expression for use with fplot
The command |fplot| only takes function handles, not symbolic objects. The easiest way to plot symbolic objects is using <http:/...
12 years ago | 4
| accepted
Entering Non-Linear System of Equations
I am not sure what exactly your program is doing, but you could try this: x = sym('x', [4, 1]) instead of |syms x|. This ...
12 years ago | 1
| accepted
solve with parameter
Try to avoid |num2str| during calculations. This will convert the input into a string. A string is basically an array of charact...
12 years ago | 0
| accepted
Problem in creating symbolic function with normcdf
It seems that |normcdf| is not defined for sym objects. You can try to express |normcdf| for syms in a more elementary way, like...
12 years ago | 0
| accepted
Creating Symbolic Functions
The concept of 'symbolic functions' including the function |argnames| have been introduced in MATLAB 2012a. You cannot use this ...
12 years ago | 0
| accepted
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