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## Main Question or Discussion Point

Dear everybody,

I wave an equation with datas and want to regress in non linear form with plot.

Would you help me to solve the equation bellow by any softwares, please?

The data, the equation and parameters are given bellow. I want to fit the data to non-linear equation to find Df and k values.

I just need help.

Your sincerely,,

M=Mo + (Mo - Ms)*Pi*8*r*Ms*

a [Sum[((k*r^2 + Pi^2*a n^2)*k*r^2*t -

Pi^2*r^2*a n^2 - (Pi^2*r^2*a) n^2*

Exp[-t*(k*r^2 + a*Pi^2 n^2)/r^2])/(k*r^2 + n^2 a*Pi^2)^2]

n=1000

ms=146.5

mo=11.58

r=0.003975

t m

0 11.58

30 72.61

60 97.89

90 106.05

120 109.63

150 117.02

180 119.57

210 125.99

240 129.56

270 132.85

I wave an equation with datas and want to regress in non linear form with plot.

Would you help me to solve the equation bellow by any softwares, please?

The data, the equation and parameters are given bellow. I want to fit the data to non-linear equation to find Df and k values.

I just need help.

Your sincerely,,

M=Mo + (Mo - Ms)*Pi*8*r*Ms*

a [Sum[((k*r^2 + Pi^2*a n^2)*k*r^2*t -

Pi^2*r^2*a n^2 - (Pi^2*r^2*a) n^2*

Exp[-t*(k*r^2 + a*Pi^2 n^2)/r^2])/(k*r^2 + n^2 a*Pi^2)^2]

n=1000

ms=146.5

mo=11.58

r=0.003975

t m

0 11.58

30 72.61

60 97.89

90 106.05

120 109.63

150 117.02

180 119.57

210 125.99

240 129.56

270 132.85

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