iteration - iterative solution python (finding the last and second last iterative values) -

-

i total beginner in programming , have write short code in python. finding iterative solution variable when difference between successive iterations no more 0.0001.

i thought of using infinite while loop how can check values obtained after second last , last iteration specify break condition.

please can explain how that?

here code i've written

icl=0.5 tc= 25  def kelvin(tc):     tk = tc +273.15     return tk  #calculate initial value tcl  tcl=kelvin(tc)+(35.5-tc)/(3.5*icl+0.1)  #calculate final value of tcl when difference between successive values of tcl <0.0001  while true:     tcl=35.7-0.028*(m-icl)*(3.96e-8*fcl((tcl+273.15)**4-(tr+273.15)**4+fcl*hc*(tcl-ta))      if .... #here not sure how break loop when above mentioned condition met

in code, store tcl need store tcl , previous_tcl. @ minimum, can modify code way:

cl=0.5 tc= 25 def kelvin(tc): tk = tc +273.15 return tk  #calculate initial values tcl , tcl_previous tcl_previous = kelvin(tc)+(35.5-tc)/(3.5*icl+0.1) tcl = 35.7-0.028*(m-icl)*(3.96e-8*fcl((tcl_previous+273.15)**4-(tr+273.15)**4+fclhc(tcl_previous-ta))  #calculate final value of tcl when difference between successive values of tcl <0.0001  while math.abs(tcl-tcl_previous)>0.0001:     tcl_previous = tcl     tcl = 35.7-0.028*(m-icl)*(3.96e-8*fcl((tcl_previous +273.15)**4-(tr+273.15)**4+fclhc(tcl_previous -ta))

note not cleanner way write because line calculates tcl tcl_previous duplicated. should encapsulate in function.


Comments

Post a Comment

Popular posts from this blog

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops', ...
Read more

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null ...
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens ...
Read more