ans representation in decimal

Good day.

Houp, I could get some hint on how to change the formatting of answers in a live script.

syms ht_inpt(mass, dlt_t, spc_ht_mtr)
ht_inpt(mass, dlt_t, spc_ht_mtr)=mass*dlt_t*spc_ht_mtr;

mass=6*u.kg;
mass_t1=(20+273)*u.K;
mass_t2=(100+273)*u.K;
spc_ht_mtr=4190*u.J/(u.kg*u.K);
dlt_t=mass_t2-mass_t1;

ht_inpt=ht_inpt(mass, dlt_t, spc_ht_mtr)

ht_inpt=2011200 J

ht_inpt = unitConvert(ht_inpt,u.kJ)

ht_inpt=10056/5 kJ

­How a document can be edited that all answers in it would be expressed with decimals?

Answer 1

[Cris LaPierre]

FYI the code you shared generates the following error

Unable to resolve the name u.kg.

Add the following to fix that:

u = symunit;

I suspect the issue is that you are using symbolic. If you want to keep your answer symbolic, see this page (specifically, sympref('FloatingPointOutput',true);). If you want to convert it to numbers, use the double function.

[Andrew]

Code with corrections for clarity.

u=symunit;
syms ht_inpt(mass, dlt_t, spc_ht_mtr)
ht_inpt(mass, dlt_t, spc_ht_mtr)=mass*dlt_t*spc_ht_mtr;
mass=6*u.kg;
mass_t1=(20+273)*u.K;
mass_t2=(100+273)*u.K;
spc_ht_mtr=4190*u.J/(u.kg*u.K);
dlt_t=mass_t2-mass_t1;
ht_inpt=ht_inpt(mass, dlt_t, spc_ht_mtr);
ht_inpt = unitConvert(ht_inpt,u.kJ)

Expected ans is 2011.2 kJ instead of 10056/5 kJ.

double didn't helpt. format long/short all so makes no changes...

[Cris LaPierre]

sympref('FloatingPointOutput',true);
ht_inpt = unitConvert(ht_inpt,u.kJ)

ht_inpt = 
    2.0112e+03 kJ

[Cris LaPierre]

[ht units] = separateUnits(ht_inpt);
double(ht)

ans = 2.0112e+03

[Andrew]

Thank You. It suits the main goal.

Is it possible to avoid “e”?

[Cris LaPierre]

For symbolic, see this post. For the double result, use format shortG.

[ht units] = separateUnits(ht_inpt);
format shortG
double(ht)

ans = 
       2011.2

If you want to include the units, you'd have to build a string.

ht_dec = sprintf('%.1f %s',double(ht),'kJ')

ht = '2011.2 kJ'

[Andrew]

TY4I :)