MAPLE Lesson4 Laptrinh

8/12/2019 MAPLE Lesson4 Laptrinh

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Khoa Ton Tin ng dng, HBK HN

MAPLE

M u

Mt s hm s hc c bn

Cc php tnh i s

Cc php tnh gii tch

th i s tuyn tnh

Lp trnh

Cc kiu d liu c cu trc v cc hm lin quan Cu trc lp trnh

Bin v th tc


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Hm op

extract operands from an expression

C php

op(i, e) op(i..j, e) op(e) op(list, e)

op(0, e)- tr li tn hm

Tham s

i,j- L s nguyn

e - L mt biu thc

list- danh sch cc s nguyn nh du v tr cc tonhng

Nu i


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Hm nop

number of operands of an expression

C php

nops(e)

Tham s

e - L mt biu thc, khng thuc kiu dy


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Hm subsop

Substi tute for specif ied operands in an expression

Thay th gi tr ca 1 ton hng xc nh trong biu thc

C phpsubsop(eq1, eq2, ..., eqn, expr)

Tham seqi - L mt phng trnh c dng v tr = biu thc

expr - l mt biu thc


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Hm seq

Creat a sequence

C phpseq(exp, i = m..n);

seq(exp, i = x)

Tham sexp - l mt biu thc

i - ch s chy

m, n thuc kin s, l khong chy ca i

x l biu thc c th p dng c hm op



Cc kiu d liu c cu trc

Dy:

L cch spxpcc itngtrong maple phn cch nhaubi1 duphynh: a,b,c

Dy nhngi trNULL nukhng c g

VD:

>sq1:=a,b,c:

>sq1,sq1,NULL;

a,b,c,a,b,c

>sq1,d;a,b,c,d

>%[1];

a




Tp hp

Mi tp hp hiu l mt dy bao trong cp ngoc nhn

{sequence}

Cch ly phn t

Tnphnt[ch s] Cc php tnh giao, hp, tr

ab a union b

ab a intersect b a-b a minus b


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Danh sch

Mi danh sch hiu l mt dy bao trong cp ngoc vung

[sequence]

Cch ly phn t

Tnphnt[ch s]

Mng


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Mng


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unevaluated Expresions


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BIN

Bin a phng:

L bin ch c tc dng trong th tc, nu thot khi thtc bins cgiiphng khi b nh.

Khaibo:

local

Bin ton cc

L bin c tc ng trong ton b h thng

Khaibo

global


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Th tc

Proc()

/RETURN()/;

end;

Proc()

local dy cc bin;

global dy cc bin;

/RETURN()/;

end;

Kt qu ca th tc l gi tr ca cu lnh cui cng.

Nu mun kt qu l mt dygi tr ta a vo hm RETURN.


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CU TRC IU KHIN

Cu trc tun t

Cu trc r nhnh

Cu trc lp

iu khin vng lp


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Cu trc r nhnh

C php

Ifthen

else

end if;

Sau cc cu lnh c th dng du ; hoc : Biu thc iu kin l biu thc logic, c th dng cc ton

t : and, or, not


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Cu trc r nhnh

C phpif then

elif then

..

elif then

else

end if;


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Vng lp while

C php

while do

end do;


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Vng lp for

C php

for in do

end do;


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Vng lp for

C php

fori /from //by//while do

end do;

Gi tr u ngm nh =1, c th m hoc dng

Bc nhy ngm nh =1, c th m hoc dng


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iu khin vng lp

Dng cho vng forv while

Lnhbreak:dng vng lp

Lnh nextchuyn iu khin v u vng lp


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I i t bi th th h d


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In gi tr biu thc theo nh dng

printf(fmt, x1, ..., xn)

Tham s

fmt output format specification

x1, x2, , xn expressions to be formatted

V d:> printf("%g %g %g", 123, 123*(1/456), 123456789);

123 0.269737 1.23457e+08

> printf("%f %10.4f %g", 123, 123*(1/456), 123456789);123.000000 0.2697 1.23457e+08

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MAPLE Lesson4 Laptrinh