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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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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] ...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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:...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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/...

約7年前 | 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 = ...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 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...

約7年前 | 2

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7年以上前 | 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,...

7年以上前 | 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 ...

7年以上前 | 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...

7年以上前 | 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...

7年以上前 | 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...

7年以上前 | 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] ...

7年以上前 | 0