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The Maxima on-line user's manual

Algebra Calculator

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At Calculator

At

Function: at (<expr>, [<eqn_1>, ..., <eqn_n>])

at (x^2, [x=7]);

Function: at (<expr>, <eqn>) Evaluates the expression <expr> with the variables assuming the values as specified for them in the list of equations [<eqn_1>, ..., <eqn_n>] or the single equation <eqn>.

If a subexpression depends on any of the variables for which a value is specified but there is no atvalue specified and it cant be otherwise evaluated, then a noun form of the at is returned which displays in a two-dimensional form.

at carries out multiple substitutions in series, not parallel.

See also atvalue. For other functions which carry out substitutions, see also subst and ev.

Examples:

          (%i1) atvalue (f(x,y), [x = 0, y = 1], a^2);
                                          2
          (%o1)                          a
          (%i2) atvalue (diff (f(x,y), x), x = 0, 1 + y);
          (%o2)                        @2 + 1
          (%i3) printprops (all, atvalue);
                                          !
                            d             !
                           --- (f(@1, @2))!       = @2 + 1
                           d@1            !
                                          !@1 = 0

2 f(0, 1) = a

          (%o3)                         done
          (%i4) diff (4*f(x, y)^2 - u(x, y)^2, x);
                            d                          d
          (%o4)  8 f(x, y) (-- (f(x, y))) - 2 u(x, y) (-- (u(x, y)))
                            dx                         dx
          (%i5) at (%, [x = 0, y = 1]);
                                                   !
                        2              d           !
          (%o5)     16 a  - 2 u(0, 1) (-- (u(x, y))!            )
                                       dx          !
                                                   !x = 0, y = 1

There are also some inexact matches for at. Try ?? at to see them.

(%o1)                                true
(%i2) 

At Example

Related Examples

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rat(0.1234);

rat(0.12345);

rat(0.12345);

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at-num-rat

rat(0.1234);

rat(0.12345);

num(rat(0.12345));

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at-rat

rat(5*(8*x^3-(30*x^4/...

rat(5*(8*x^3-(30*x^4/...

rat(5*(8*x^3-30*x^4/y...

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at-pochhammer-rat

rat(pochhammer(a+1,n)...

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at-cos-diff-linsolve-pi-plot2d-quad_qags-sin-subst
plot2d([parametric,x(t),y(t),[t,0,1]]);

sd: 0.6;

f0: s^2*(a0 + a1*s + ...

c0: at(f0,s=1)=%pi;

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at-block-cons-if-listp-piece

map_apply_at(ll,xx,f)...

map_f_at(ll,xx,f):=bl...

ll:[2,3,[a,b,[t,y,[u,...

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at-num-numer-rat

rat(0.1234);

rat(0.12345);

num(rat(0.12345))/5, ...

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at-eigenvalues-invert-jacobian

A: jacobian ([a*If*Sh...

B: jacobian ([gh*Ih, ...

C: invert (B);

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at-eigenvalues-invert-jacobian

A: jacobian ([z*If*Sh...

B: jacobian ([1/r*Ih,...

C: invert (B);

Calculate