已回答
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...

7 years 前 | 0

已回答
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...

7 years 前 | 0

| 已接受

已回答
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...

7 years 前 | 0

| 已接受

已回答
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] ...

7 years 前 | 3

| 已接受

已回答
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...

7 years 前 | 1

| 已接受

已回答
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...

7 years 前 | 0

已回答
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:...

7 years 前 | 2

已回答
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...

7 years 前 | 0

已回答
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...

7 years 前 | 0

已回答
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...

7 years 前 | 0

已回答
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...

7 years 前 | 0

| 已接受

已回答
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...

7 years 前 | 1

| 已接受

已回答
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...

7 years 前 | 0

已回答
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...

7 years 前 | 1

| 已接受

已回答
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/...

7 years 前 | 1

已回答
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 = ...

7 years 前 | 0

| 已接受

已回答
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...

7 years 前 | 1

| 已接受

已回答
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...

7 years 前 | 1

| 已接受

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

7 years 前 | 0

已回答
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...

7 years 前 | 0

已回答
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...

7 years 前 | 0

| 已接受

已回答
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...

7 years 前 | 1

已回答
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...

7 years 前 | 2

| 已接受

7 years 前 | 0

已回答
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 years 前 | 1

| 已接受

已回答
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 years 前 | 0

| 已接受

已回答
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 years 前 | 0

| 已接受

已回答
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 years 前 | 5

已回答
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 years 前 | 0

已回答
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 years 前 | 0