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The Maxima on-line user's manual

Algebra Calculator

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Globalsolve Calculator

Globalsolve

-- Option variable: globalsolve Default value: false

When globalsolve is true, solved-for variables are assigned the solution values found by linsolve, and by solve when solving two or more linear equations.

e1 : (0^3)*k + (0^2)*l + 0*m + n = 0;
e2 : 3*(0^2)*k + 2*0*l + m = 0.8;
e3 : (10^3)*k + (10^2)*l + 10*m + n - (10^2)*a - 10*b -c = 0;
e4 : 3*(10^2)*k + 2*10*l + m - 2*10*a - b = 0;
e5 : (100^3)*p + (100^2)*q + 100*r + s = -40;
e6 : 3*(100^2)*p + 2*100*q + r = -1.6;
e7 : (90^3)*p + (90^2)*q + 90*r + s - (90^2)*a - 90*b - c = 0;
e8 : 3*(90^2)*p + 2*90*q + r - 2*90*a - b = 0;
e9 : 2*(100/33)*a + b = 0;
e10 : ((100/33)^2)*a + (100/33)*b + c = 30;
e11 :  (10^3)*k + (10^2)*l + 10*m + n = 10;
e12 : (90^3)*p + (90^2)*q + 90*r + s = 10;
e13 : 3*(10^2)*k + 2*10*l + m = 2.4;
e14 : 3*(90^2)*p + 2*90*q + r = -2.4;
[globalsolve: true];
linsolve([e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e13], [a, b, c, k, l, m, n, p, q, r, s]);
f(a1,b1,c1,x) := a1*(x^2) + b1*x + c1;
g(x):= p*(x^3) + q*(x^2) + r*x +s;
plot2d(f(a, b, c, x),[x,10,90]);
plot2d(g,[x,0,10]);
plot2d(f(a, b, c, x),[x,10,90]);

When globalsolve is false, solutions found by linsolve and by solve when solving two or more linear equations are expressed as equations, and the solved-for variables are not assigned.

When solving anything other than two or more linear equations, solve ignores globalsolve. Other functions which solve equations (e.g., algsys) always ignore globalsolve.

Examples:

          (%i1) globalsolve: true$
          (%i2) solve ([x + 3*y = 2, 2*x - y = 5], [x, y]);
          Solution

                                           17
          (%t2)                        x : --
                                           7

                                             1
          (%t3)                        y : - -
                                             7
          (%o3)                     [[%t2, %t3]]
          (%i3) x;
                                         17
          (%o3)                          --
                                         7
          (%i4) y;
                                           1
          (%o4)                          - -
                                           7
          (%i5) globalsolve: false$
          (%i6) kill (x, y)$
          (%i7) solve ([x + 3*y = 2, 2*x - y = 5], [x, y]);
          Solution

                                           17
          (%t7)                        x = --
                                           7

                                             1
          (%t8)                        y = - -
                                             7
          (%o8)                     [[%t7, %t8]]
          (%i8) x;
          (%o8)                           x
          (%i9) y;
          (%o9)                           y

(%o1)                                true
(%i2) 

Globalsolve Example

Related Examples

globalsolve-linsolve-programmode

e1: -19 - 3*s - 13*r ...

e2: 23 + 10*s + 3*r = 0;

[globalsolve: false,...

Calculate

globalsolve-true

globalsolve: true;

e1:1.6;

e2:0.8;

Calculate

globalsolve-linsolve-true

globalsolve: true;

eq1:R1+(phi1-phi3)*32...

eq2:R2+(phi2-phi3)*32...

Calculate

globalsolve-linsolve-true

l1: 303.4;

l2: 601.684;

l3: 45;

Calculate

globalsolve-linsolve-true

globalsolve: true;

eq1: R1 + (p3 - p1)*l...

eq2: R2 + (p3 - p1)*l...

Calculate

globalsolve-linsolve-plot2d-true
plot2d([w10(x),w20(x),w30(x)], [x,0,15], [y, -1000, 1000]);

/*Biegelinie für eine...

w10(x):=(-q1/24*x^4+c...

w11(x):=(-q1/6*x^3+c1...

Calculate

globalsolve-linsolve-sqrt-true

h: 45;

e3: 2;

l1: 2*sqrt(150*150+(4...

Calculate

globalsolve-true

globalsolve: true;

G1: X=g11*x+g12*y+g13...

G2: Y=g21*x+g22*y+g23...

Calculate

globalsolve-linsolve-true

/*Biegelinie für eine...

a1:Fl/EI;

w10(x):=(c10*exp^((a1...

Calculate

globalsolve-linsolve-programmode

e1: t - 4 - s -8 + 4*...

e2: t - 4 - s - 4 + ...

[globalsolve: false,...

Calculate