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Why doesn't this code solve the equation?
Answered in <http://www.mathworks.com/matlabcentral/newsreader/view_thread/347804?s_cid=ans2doc_man_link http://www.mathworks.co...

plus de 6 ans il y a | 0

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Display a variable and its units
Units are now in MATLAB if you have Symbolic Math Toolbox. Try this, and see the tutorial: <https://www.mathworks.com/help/symbo...

plus de 6 ans il y a | 0

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How to add units to a number and differentiate between different inputs
Units are now in MATLAB if you have Symbolic Math Toolbox. Try this, and see the tutorial: <https://www.mathworks.com/help/symbo...

plus de 6 ans il y a | 0

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how to set a unit to variable?
Units are now in MATLAB if you have Symbolic Math Toolbox. Try: >> u = symunit; >> x = 2*u.meter x = 2*[m] ...

plus de 6 ans il y a | 3

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Usage of roots and solve in MATLAB
1. To understand the difference between numeric and symbolic arithmetic, please see: <https://www.mathworks.com/help/symbolic/ch...

plus de 6 ans il y a | 1

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Jacobian of equation with left and right hand sides
Starting R2017a, The "lhs" and "rhs" functions are available. See: <https://www.mathworks.com/help/symbolic/lhs.html?s_cid=an...

plus de 6 ans il y a | 0

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How to arrange equation variable on right and left hand side?
Starting R2017a, use the "isolate" function: <https://www.mathworks.com/help/symbolic/isolate.html?s_cid=ans2doc_man_link https:...

plus de 6 ans il y a | 2

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How to plot the symbolic expression given by "root"
If I understand correctly, you're asking " _How can I automatically substitute values into a symbolic expression?_". Use the sub...

plus de 6 ans il y a | 0

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Error using integral: A and B must be floating-point scalars
To represent integration with symbolic variables, use "int" instead of "integral". <https://www.mathworks.com/help/symbolic/i...

plus de 6 ans il y a | 0

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Create a general function or script, where the user can specify the number of variables, which is both symbolic and possible to evaluate with fminunc?
* To use fminunc, first convert the Symbolic function to a MATLAB function using <https://www.mathworks.com/help/symbolic/matlab...

plus de 6 ans il y a | 0

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Help with piecewise function? Can't use else/if?
If you have R2016b, you can just use the piecewise function: <https://www.mathworks.com/help/symbolic/piecewise.html?s_cid=ans2d...

plus de 6 ans il y a | 0

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How to define ranges for solutions in this example
To specify ranges for multiple variables, see the last example on <https://www.mathworks.com/help/symbolic/solve-equations-numer...

plus de 6 ans il y a | 1

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help to fix this numeric symbolic array
You can't have a "numeric symbolic" array because "numeric" and "symbolic" are different data types. For your options, see <http...

plus de 6 ans il y a | 0

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Error using FEVAL Produced on an Attempt at calling fplot
First, a side note that you should format code in your posts: <https://www.mathworks.com/matlabcentral/answers/13205-tutorial-ho...

plus de 6 ans il y a | 1

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How to convert strings to symbolic expressions without sym()?
Why do you need to convert strings to symbolic expressions? EDIT: Starting R2017b, use <https://www.mathworks.com/help/symbolic/...

plus de 6 ans il y a | 1

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How can I compute Jacobi Elliptic Functions in Matlab where the modulus is > 1?
Starting R2017b, all Jacobi Elliptic functions in MATLAB with Symbolic Math Toolbox. Example: >> jacobiCD(1,3) ans = ...

plus de 6 ans il y a | 0

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How to calculate imaginary part of incomplete gamma function in matlab.
You can find "gammainc" for imaginary input values using the Symbolic "igamma" function. Carefully read the note in the "Descrip...

plus de 6 ans il y a | 1

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Matlab Numerical integral improvement
Updated answer for R2017b. Use <https://www.mathworks.com/help/symbolic/int.html?s_cid=ans2doc_man_link int> and convert the sym...

plus de 6 ans il y a | 1

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symb toolbox newby?
Please start with the Symbolic Getting Started: <https://www.mathworks.com/help/symbolic/getting-started-with-symbolic-math-tool...

plus de 6 ans il y a | 0

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Symbolic math solve numeric approximation
Question: When does the Symbolic Math "solve" statement try to find a numeric approximation? "solve" tries to find a symbolic...

plus de 6 ans il y a | 0

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How to combine numerator and denominator in original form
The answer is in this example on the sym doc page: <https://www.mathworks.com/help/symbolic/sym.html#bu7u7ur-6?s_cid=ans2doc_man...

plus de 6 ans il y a | 0

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How do I convert a string input to an executable equation?
For symbolic equations, starting R2017b, use <https://www.mathworks.com/help/symbolic/str2sym.html?s_cid=ans2doc_man_link str2sy...

plus de 6 ans il y a | 1

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symbolic evaluation where function is obtained from user input text
Starting R2017b, use <https://www.mathworks.com/help/symbolic/str2sym.html?s_cid=ans2doc_man_link str2sym>. >> prompt = 'in...

plus de 6 ans il y a | 2

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How can I take the f(y)th-order derivative of another function?
Use |.*| instead of |*| , and for the why, look up those operators or simply search for your error |Inner matrix dimensions must...

presque 7 ans il y a | 0

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Can't find explicit solution
You can check Walter's suggestion that the solution is in limits as >> limit(dLdb,b,0) ans = NaN >> limit(dLdy0,b,...

presque 7 ans il y a | 1

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Integral of a gaussian function wrong answer
I could get the algebraic answer but it required calling "simplify" twice. Need to investigate this further. >> syms x A ...

presque 7 ans il y a | 0

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How to work with piecewise results that are returned by the solve() function
Honestly, the simplest solution is to upgrade to at least R2016b where "piecewise" was introduced in Symbolic Math Toolbox. Othe...

presque 7 ans il y a | 0

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How to find the derivative of the function at some value of x?
To differentiate a function and then find the value, use symbolic functions. For details, see <https://www.mathworks.com/help/sy...

presque 7 ans il y a | 5

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Optimizing program to get faster results
Following up on my comment above: 1. Do not overwrite symbolic variables with numeric values. So don't do syms B D an...

environ 7 ans il y a | 0

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How can I solve A*X + X*B = C equation for X? where A, B&C are 2*2 matrixes.
You can solve this with the symbolic toolbox if you declare "X" as a matrix: >> X = sym('x%d',[2 2]) X = [ x11, x12] ...

environ 7 ans il y a | 0

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