/usr/share/octave/packages/symbolic-1.1.0/doc-cache is in octave-symbolic 1.1.0-3.
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findsym
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-- Function File: VARS = findsym (F, N)
Find symbols in expression F and return them comma-separated in
string VARS. The symbols are sorted in alphabetic order. If N is
specified, the N symbols closest to "x" are returned.
Example:
symbols
x = sym ("x");
y = sym ("y");
f = x^2+3*x*y-y^2;
vars = findsym (f);
vars2 = findsym (f,1);
This is intended for m****b compatibility, calls findsymbols().
See also: findsymbols.
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Find symbols in expression F and return them comma-separated in string
VARS.
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poly2sym
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-- Function File: P = poly2sym (C, X)
Creates a symbolic polynomial expression P with coefficients C. If
P is not specified, the free variable is set to sym("x"). C may be
a vector or a cell-array of symbols. X may be a symbolic
expression or a string. The coefficients correspond to decreasing
exponent of the free variable.
Example:
symbols
x = sym("x");
y = sym("y");
p = poly2sym ([2,5,-3]); # p = 2*x^2+5*x-3
c = poly2sym ({2*y,5,-3},x); # p = 2*y*x^2+5*x-3
See also: sym2poly,polyval,roots.
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Creates a symbolic polynomial expression P with coefficients C.
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splot
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-- Function File: splot( F ,X,RANGE)
Plot a symbolic function f(x) over range.
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Plot a symbolic function f(x) over range.
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sym2poly
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-- Function File: C = sym2poly (P, X)
Returns the coefficients of the symbolic polynomial expression P as
a vector. If there is only one free variable in P the coefficient
vector C is a plain numeric vector. If there is more than one free
variable in P, a second argument X specifies the free variable and
the function returns a cell vector of symbolic expressions. The
coefficients correspond to decreasing exponent of the free
variable.
Example:
symbols
x = sym("x");
y = sym("y");
c = sym2poly (x^2+3*x-4); # c = [1,3,-4]
c = sym2poly (x^2+y*x,x); # c = {sym("1"),y,sym("0.0")}
If P is not a polynomial the result has no warranty.
See also: poly2sym,polyval,roots.
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Returns the coefficients of the symbolic polynomial expression P as a
vector.
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symfsolve
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-- Function File: [X, INF, MSG] = symfsolve (...)
Solve a set of symbolic equations using 'fsolve'. There are a
number of ways in which this function can be called.
This solves for all free variables, initial values set to 0:
symbols
x=sym("x"); y=sym("y");
f=x^2+3*x-1; g=x*y-y^2+3;
a = symfsolve(f,g);
This solves for x and y and sets the initial values to 1 and 5
respectively:
a = symfsolve(f,g,x,1,y,5);
a = symfsolve(f,g,{x==1,y==5});
a = symfsolve(f,g,[1 5]);
In all the previous examples vector a holds the results: x=a(1),
y=a(2). If initial conditions are specified with variables, the
latter determine output order:
a = symfsolve(f,g,{y==1,x==2}); # here y=a(1), x=a(2)
The system of equations to solve for can be given as separate
arguments or as a single cell-array:
a = symfsolve({f,g},{y==1,x==2}); # here y=a(1), x=a(2)
If the variables are not specified explicitly with the initial
conditions, they are placed in alphabetic order. The system of
equations can be comma- separated or given in a cell-array. The
return-values are those of fsolve; X holds the found roots.
See also: fsolve.
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Solve a set of symbolic equations using 'fsolve'.
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