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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

at-cos-phi-plot3d-sin-sqrt
plot3d(at(f,r=1/rI),[rI,1/2,3/2],[phi,-%pi,%pi],[grid,100,30]);

f:2*r*sin(%pi/r)/sqrt...

plot3d(at(f,r=1/rI),[...

Calculate

at-rat

rat((x-0.5)*(2/L)*G*J...

Calculate

at-diff

at(diff(10*x^3 -6*x^2...

Calculate

at-cos-exp-laplace

laplace (exp (-at) * ...

Calculate

at

at(2*(x+y+z)^w, x+y+z...

Calculate

at-diff-factor-sqrt

f(x,y,A) := sqrt((1+x...

f20(x,y,A) := diff(f(...

f11(x,y,A) := diff(di...

Calculate

at-float-solve

z: V1*p1/T1 = V2*p2/T2;

isop: z, p1=1, p2=1;

isoV: z, V1=1, V2=1;

Calculate

at-float-solve

z: V1*p1/T1 = V2*p2/T2;

isop: z, p1=1, p2=1;

isoV: z, V1=1, V2=1;

Calculate

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,...

Calculate

at-rat

rat((x^4-x^3-11*x^2+9...

rat((2-x)/(x+1))*(3*x...

rat((x^3+2*x^2+4*x+8)...

Calculate