## 60 Reputation

1 years, 203 days

## least square curve fitting ...

Maple 2023

can someone help me curve fitting these parameeters...i only got 1 for all of this 90As4.mw

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 (1)
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 The solution was obtained with the following warning:   no iterations performed as initial point satisfies first-order conditions
 (2)

## partial dervative of function ?...

Maple

using diff command to find  partial dervative of function g give zero in maple...it shouldn't be zero...how to fix itpartial_dervative.mw

 > restart:
 >
 > sigma_t:= map(epsilon-> E_0[90]*epsilon_dot*((epsilon/epsilon_dot)-(sum(p[i], i = 1 .. 3)*(epsilon/epsilon_dot))+(sum(p[i]*tau[i],i=1..3))-(sum(p[i]*tau[i]*exp(-(epsilon/(epsilon_dot*tau[i]))),i=1..3))),true_strain):
 > g:= sum(( sigma[j]-sigma_t[j])^2,j=1..10):
 > diff(g,p[1]);
 (1)

## what kind of algothrim does maple used t...

Maple

if i want to solve non linear least square problem ..maple optimazation Interactive box show ..many option...but when it comes to least square default....what kind of algothrim does it used....and in maple ..NonLinear fit commad use what kind of algothrim?..Levenberg-Marquardt algorithm?

## how to solve this integration using inte...

Maple 2023

how to solve this using integration by parts?

 > restart:
 > with(IntegrationTools):
 >
 > eq1:=int(1-(sum(p[i]*(1-exp(-((t-xi)/tau[i]))),i=1..n)),xi=0..t);
 (1)

## linear gression to get weibull parameter...

Maple 2023

weibull_damage.mw
i have weibull plot...and i want to get size and shpae parametr...how can i get ...parameters .i don't know how to perform linear regression to get these parameters in maple..please help

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