FDS

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15 years, 177 days

MaplePrimes Activity


These are questions asked by FDS

Dear All, If I understood well dsolve uses the RK45 method to solve an ODE. I would like to compare the results of tha attached worksheet with the results of another software that uses RK4 as a standard. Can I adapt my worksheet to use RK4 and how do you do that? Thanks in advance for your willingness to help me out.QMP_Nov21.mw

Dear Collaboratory, as a former mathcad user I am trying to transfer slowly towards Maple. In the attached file I have a problem in solving the ODE numerical. I would appreciate it if someone would be willing to help me out. I tried to upload my maple file but I am not sure it is attached.

A few days ago my Windows 10 (32 bit) operating system did an update of my Excel 2016. Since that moment I get following message:

However the addin toolbar is still present and WMIMPLEX.xla file is also still present. Removing and reinstalling the addin did not help. So I am wondering what other solutions could be done.

Aside of this I would like to ask some help for the correct syntax in Thermodynamics package calculating water vapor pressure. For one or another reason I do not succeed to find the correct syntax to obtain the water vapor pressure at 24°C.

Thank you in advance for any help

As a newbie I tried to do some simple calculations. Unfortunately one of my calculations does not solve. I assume I do not see the obvious. Would someone be so kind to help me out? Thank you
 

restart

with(LinearAlgebra)

pH := Vector(2, {(1) = 7.17, (2) = 7.25})

Vector[column](%id = 4598165698)

(1)

pCO2 := Vector(2, {(1) = 74, (2) = 56})

Vector[column](%id = 4696862338)

(2)

pK := 6.1

6.1

(3)

CO2 := `~`[`*`](pCO2, 0.3e-1)

Vector[column](%id = 4696842050)

(4)

HCO3 := `~`[`*`](`~`[`*`](0.3e-1, pCO2), 10^`~`[`-`](pH, pK))

Error, (in rtable/Power) exponentiation operation not defined for non-algebraic exponents

 

TCO2 := CO2+HCO3

28.30272572

(5)

VCO2 := 22.4*(28.3-25.41)*5.9

381.9424

(6)

NULL


 

Download test.mw
 

restart

with(LinearAlgebra)

pH := Vector(2, {(1) = 7.17, (2) = 7.25})

Vector[column](%id = 4598165698)

(1)

pCO2 := Vector(2, {(1) = 74, (2) = 56})

Vector[column](%id = 4696862338)

(2)

pK := 6.1

6.1

(3)

CO2 := `~`[`*`](pCO2, 0.3e-1)

Vector[column](%id = 4696842050)

(4)

HCO3 := `~`[`*`](`~`[`*`](0.3e-1, pCO2), 10^`~`[`-`](pH, pK))

Error, (in rtable/Power) exponentiation operation not defined for non-algebraic exponents

 

TCO2 := CO2+HCO3

28.30272572

(5)

VCO2 := 22.4*(28.3-25.41)*5.9

381.9424

(6)

NULL


 

Download test.mw

 

Dear, I am a newby using Maple and encounter following issue: when I multiply a vector with 2 elements and units [m] with e.g. 6 [m] using the *~ for an element by element multiplication this works as it should. However, when I try to multiply a vector with 2 elements and units [mA] and multiply this in the same way as above with 14 [V] I get as answer 2 results with a correct multiplication but followed by V mA. First I would expect [W] as unit but the V mA in the result vector are apparently no units. What am I doing wrong?

Thank you for any help.

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