Contribute at least one answer each month for 6 consecutive months
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Awarded to Alexander on 20 Jul 2017
Solve a problem for the first time
Awarded to Alexander on 25 Jul 2012
Feeds
已回答
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...
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 前 | 0
已回答
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(_...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
已回答
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 = ...
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 前 | 1
已回答
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...
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 前 | 0
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
solve command
Seems to be the same problem as here: <http://www.mathworks.de/matlabcentral/answers/40281-substitution-after-differentiation-ea...
solve command
Seems to be the same problem as here: <http://www.mathworks.de/matlabcentral/answers/40281-substitution-after-differentiation-ea...
12 years 前 | 0
| 已接受
已回答
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...
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 前 | 1
已回答
integration
Why do you think that the answer is incorrect? If you just want a number, use |double| on the result: >> double(H0) ...
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 前 | 3
已回答
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...
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 前 | 0
已回答
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...
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 前 | 0
已回答
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...
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 前 | 0
已回答
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...
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 前 | 0
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 1
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 1
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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)*...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 1
| 已接受
已回答
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:/...
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 前 | 4
| 已接受
已回答
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 ...
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 前 | 1
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
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...
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 前 | 0
| 已接受
已回答
Creating Symbolic Functions
The concept of 'symbolic functions' including the function |argnames| have been introduced in MATLAB 2012a. You cannot use this ...
Creating Symbolic Functions
The concept of 'symbolic functions' including the function |argnames| have been introduced in MATLAB 2012a. You cannot use this ...
12 years 前 | 0
| 已接受
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