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More symbolic solver issues

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Robert
Robert 2016-10-21
编辑： Robert 2016-10-21
Im really getting tired of matlab being shown up by wolfram alpha. A program designed for high school kids
Very simple bit of code here
solve('((5*x + 13)*((25*x)/6 + 47/6) - 30)/((25*x)/6 + 47/6)>0')
and i get "can not find an explicit solution
type the same thing in wolfram alpha and i get an answer for x with out a single problem
why??? Now that I've waste 1.5 days on this foolishness
And yes i know all about the loss of matlab character string support for matlab and such. that is not the issue here.

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回答（1 个）

Sean de Wolski
Sean de Wolski 2016-10-21
编辑：Sean de Wolski 2016-10-21
>>syms x
>>solve(((5*x + 13)*((25*x)/6 + 47/6) - 30)/((25*x)/6 + 47/6)>0,'IgnoreAnalyticConstraints',true)
ans =
(3*109^(1/2))/25 - 31/25
- (3*109^(1/2))/50 - 103/50
>> double(ans)
ans =
0.0128
-2.6864
>> subs(((5*x + 13)*((25*x)/6 + 47/6) - 30)/((25*x)/6 + 47/6)>0,x,ans)
ans =
0 < 9101248911870249387665321454522297509/982817047206512525305913255026229248
0 < 24126042787404995123109035636891/2839602102211972252884472430592
  1 个评论
Robert
Robert 2016-10-21
编辑：Robert 2016-10-21
O right, excuse me, i forgot i have to tell matlab to do some obscure command to get it to solve a simple one variable equation. Great job math works! And they wonder why educators are choosing maple and mathematica over matlab these days
And using that command you get a totally different answer then wolfram alpha

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