Aung

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These are questions asked by Aung

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]);

0

(1)
 

 

Download partial_dervative.mw

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 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);

int(1-(sum(p[i]*(1-exp(-(t-xi)/tau[i])), i = 1 .. n)), xi = 0 .. t)

(1)


Download 1111.mw

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

 is there anything to get hypergeo function to get algebric expression?
2*hypergeom([1/2, -k/2], [1 - k/2], csc(omega*T)^2)
how ca i change this expression to some function form?...i'm new to hypergeom functions..it somehow come to my thesis?

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