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 '=': new parameter for solve(arg1,arg2,'=')
06-16-2018, 02:30 AM (This post was last modified: 08-10-2018 02:59 PM by compsystems.)
Post: #1
 compsystems Senior Member Posts: 1,382 Joined: Dec 2013
'=': new parameter for solve(arg1,arg2,'=')
The hp-prime CAS Software Version: 2.0.0.13865 (2018 07 06) now solve accepts a new parameter to visualize the most explicit answers =)

Examples

without '='
0: [solve((x+4) = 2,x), solve((-3+x) = -4,x),solve((3+x) = 4,x), solve((x+3) = 3,x)]

returns the solution
-2
-1
1
0

with '='
1: [solve((x+4) = 2,x,'='), solve((-3+x) = -4,x,'='),solve((3+x) = 4,x,'='), solve((x+3) = 3,x,'=')]

returns the solution set

x = -2
x = -1
x = 1
x = 0

2: solve([(x+y) = 2,(x-y) = 4],[x,y],'=') returns

[x = 3,y = -1]

3: solve([(x+y) = 2,(x-y) = 4],[y,x],'=')

[y = -1, x = 3]

Although the format converter cmd (list2exp) has not yet been incorporated on hp-prime =(

list2exp cmd: list of solutions to boolean expression

XCAS

4: list2exp( solve([(j+l) = 2,(j-l) = 4],[j,l]),[j,l])
returns
j=3 and l=-1
http://www.wolframalpha.com/input/?i=sol...%5Bj,l%5D)

5: list2exp( solve([(j+l) = 2,(j-l) = 4],[l,j]),[l,j])
returns
l=-1 and j=3
http://www.wolframalpha.com/input/?i=sol...%5Bl,j%5D)

6: list2exp(solve([ y = x^2, y = 2*x + 3 ],[y,x]),[y,x])
returns
( (y=9) and (x=3) ) or ( (y=1) and (x=-1) )
http://www.wolframalpha.com/input/?i=sol...%5By,x%5D)

7: solve([ y = x^2, y = 2*x + 3 ],[y,x])
[[9,3],[1,-1]]

still not working for desolve

desolve(((y')'+y) = 0,y) returns G_0*cos(x)+G_1*sin(x)

desolve(((y')'+y) = 0,y,'=') =>
y(x)=G_0*cos(x)+G_1*sin(x)

http://www.wolframalpha.com/input/?i=DSo...x%5D,+x%5D
returns
y[x]->C[1]*Cos[x] + C[2]*Sin[x]
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