Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 0

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 0

| A accepté

Réponse apportée
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] ...

presque 7 ans il y a | 3

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 1

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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:...

presque 7 ans il y a | 2

Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 0

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 1

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 1

| A accepté

Réponse apportée
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/...

presque 7 ans il y a | 1

Réponse apportée
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 = ...

presque 7 ans il y a | 0

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 1

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 1

| A accepté

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

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 0

Réponse apportée
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...

presque 7 ans il y a | 0

| A accepté

Réponse apportée
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...

presque 7 ans il y a | 1

Réponse apportée
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...

presque 7 ans il y a | 2

| A accepté

presque 7 ans il y a | 0

Réponse apportée
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

| A accepté

Réponse apportée
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 ...

environ 7 ans il y a | 0

| A accepté

Réponse apportée
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...

environ 7 ans il y a | 0

| A accepté

Réponse apportée
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...

environ 7 ans il y a | 5

Réponse apportée
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

Réponse apportée
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