Result ilaplace a number

2013 7 29
2 个回答
更新时间：2015 7 7
3 次查看（30 天）

0 个投票

Hi,
from this code:
a=55/4/sym('s^2');
b=ilaplace(a);
I got:
(55*t)/4
How can I get result like 13,75*t????
Thanks

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-7-29

0 个投票

double(coeffs(b))

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john
john 2013-7-30
Hm...but if:
b=(55*t+4*t^2+3*t^3+2+exp(t))/4;
thant I get: 0.5000 0.2500 13.7500 1.0000 0.7500
But how can I use this result? How can I connect individual result to the responding variable? Or how can I create result in form:
0.5+0.25*exp(t)+13.75*t+t^2+0.75*t^3
Thank you
Azzi Abdelmalek
Azzi Abdelmalek 2013-7-30
编辑：Azzi Abdelmalek 2013-7-30
syms t
b=(-55*t+4*t^2+3*t^3+2+exp(t))/4
[ii,jj]=coeffs(b)
s=[]
for k=1:numel(ii)
s=[s sprintf(['%0.5g*' char(jj(k)) '+'],double(ii(k))) ]
end
s(end)=[]
s=regexprep(s,'+-','-')
s=regexprep(s,'*1','')
john
john 2013-7-30
[1, t] means always exp(t)?
Azzi Abdelmalek
Azzi Abdelmalek 2013-7-31
what do you mean?
john
john 2013-8-1
In variable "b" exist exp(t)/4...but result is 0.25*[1, t]....so [1, t] means always expression "exp(t)"?

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RahulTandon
RahulTandon 2015-7-7

0 个投票

a=55/4/sym('s^2'); b=ilaplace(a); vpa(b) % this will give you the complete answer!

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john
john
2013-7-29

回答：

RahulTandon
RahulTandon
2015-7-7

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