# Question:How to use numeric in dsolve?

## Question:How to use numeric in dsolve?

Maple 17

So im trying to solve multiple ODES using dsolve(numeric) but I jsut cant get it to work.

I kep getting this one error:

Error, (in f) unable to store '-HFloat(0.020918994979034728)-HFloat(0.09184018333019917)*I' when datatype=float[8]

(for some reason the uploaded file didnt show the error at the bottom so i just pasted it in the spot it would appear.

 > Given:
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 (1)
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 (2)
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 (3)
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 (4)
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 (5)
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 (6)
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 (7)
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 (8)
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 (9)
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 (10)
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 (11)
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 (12)
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 (13)
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 (14)
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 (15)
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 (16)
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 > density calculation n/v = (P/RT)*mw_air, kg/m^3
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 (17)
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 > Volumetric flow, m^3/s
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 (18)
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 > Superficial velocity, m/s
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 (19)
 > Gs constant, kg/m^2-s
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 (20)
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 (21)
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 > Void fraction, epsilon,b
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 (22)
 > hi
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 (23)
 > kinetic parameter
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 (24)
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 (25)
 > thermal conductivity calculations
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 (26)
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 (27)
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 (28)
 > Heat of reaction (deltaH), Find heat of formation for each reactant and product--> dHrxn = heat of formation(product)-heat of formation(reactant)
 > heat of formation = A + B*T + C*T^2
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 (29)
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 (30)
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 (31)
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 (32)
 > Solving nodified Ergun Equation
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 (33)
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 > Determining U of the wall and Ueffective
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 (34)
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 (35)
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 (36)
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 (37)
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 (38)
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 (39)
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 (40)
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 (41)
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 Error, (in f) unable to store '-HFloat(0.020918994979034728)-HFloat(0.09184018333019917)*I' when datatype=float[8]
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