zjervoj97

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These are questions asked by zjervoj97

Range of parameter in NonlinearFit...

Asked: zjervoj97 40 Product: Maple 2020

September 22 2021

2 0

Hi,

I'd like to know, if it is possible to define any sort of range for parameters in NonlinearFit. E. g. I know that one of parameters should be somewhere between 0.2 - 0.4. I know there is a possibility of initalvalues, but using it doesn't lead into this range.

Thanks.

How to print row number from external fi...

Asked: zjervoj97 40 Product: Maple 2020

April 25 2021

3 6

Hi,

I need to find out how to print the number of row or the numbers on right based only on the combination of the two numbers in first two columns. The external file looks like this:

I have prepared possible combinations of numbers and I need to read the numbers on the right which belongs to this combination. There is no such thing as the sum of two numbers = number of row, so it can't be done this easy.

Can somebody help please? Thanks a lot

How to write just a part of axis label i...

Asked: zjervoj97 40 Product: Maple 2020

March 29 2021

2 0

Hello,

is there any possibility how to write just a part of axis label e.g. in Italic? For example if I want want a label to be "ln(h)" and i want just the "h" to be written in Italic font.

Thanks a lot.

fsolve returns just what i wrote...

Asked: zjervoj97 40 Product: Maple 2020

January 02 2021

3 0

Hello,

when trying to solve equation using fsolve, it returns just what i wrote and didn't solve. Can anyone help? I tried all i know. File is attached below.

Thanks a lot.

II.01.mw

When running a for do cycle the first tw...

Asked: zjervoj97 40 Product: Maple

April 24 2020

2 3

Hi,

when running a for do cycle the first two solutions are exact the same numbers, which is not correct. Can someone plesa help me fix this problem?

Thanks a lot.

restart

>	tmin:=10: #°C

>	tmax:=70: #°C

>	Tmin:=tmin+273.15:

>	Tmax:=tmax+273.15:

T:='T':

i:=0:

for T from Tmin by 2 to Tmax+1.25 do
i:=i+1:
a12:=2305.28444347652 - 9.14490843016421*T + 0.00680052257590234*T^2:
a21:=-6665.24838284836 + 46.0897018087247*T - 0.0694991633494123*T^2:
alfa:=0.3:
x2:=1-x1:
lng1:=x2^2*(tau21*(G21/(x1+x2*G21))^2+tau12*(G12/((x2+x1*G12)^2))):
lng2:=x1^2*(tau12*(G12/(x2+x1*G12))^2+tau21*(G21/((x1+x2*G21)^2))):
G12:=exp(-alfa*tau12):
G21:=exp(-alfa*tau21):
tau12:=a12/T:
tau21:=a21/T:
lnga1:=subs(x1=xa1,lng1):
lngb1:=subs(x1=xb1,lng1):
lnga2:=subs(x1=xa1,lng2):
lngb2:=subs(x1=xb1,lng2):
r1:=lnga1+ln(xa1)=lngb1+ln(xb1):
r2:=lnga2+ln(1-xa1)=lngb2+ln(1-xb1):
r:=fsolve({r1,r2},{xa1=0..0.22,xb1=0.22..1}):
assign(r):
xA1[i]:=xa1: xB1[i]:=xb1:
print(i,T,xA1[i],xB1[i]);
unassign('r1','r2','r','xa1','xb1'):
od: