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توابع لازم براي گرد كردن در متلب - دکتر سعید عربعامری

توابع لازم براي گرد كردن در متلب

توابع لازم براي گرد كردن

گاهي لازم است كه يك عدد غير صحيح را به يك عدد صحيح گرد كنـي . ايـن عـدد صحيح ميتواند عدد صحيح بزرگتر از آن و يا عدد صحيح كوچكتر باشد. توابع زير هر يك به طريقي اين كار را انجام ميدهند.

842

 

به عنوان مثال فرض كنيد ماتريس A كه حاوي تعدادي عدد غير صحيح است را داشته باشيم. توابع فوق روي اين ماتريس عمل نموده و نتايج زير بدست مي آيند :

>> A=[-1.9 -1.5 -1.1 -0.01 0.01 1.1 1.5 1.9]

A= -1.9 -1.5 -1.1 -0.01 0.01 1.1 1.5 1.9

>> ceil(A)

ans= -1 -1 -1 0 1 2 2 2

>> floor(A)

ans= -2 -2 -2 -1 0 1 1 1

>> round(A)

ans= -2 -2 -1 0 0 1 2 2

>> fix(A)

ans= -1 -1 -1 0 0 1 1 1

از ديگر توابع رياضي كه در همين بخش به آن اشاره ميكنيم sign است . اين تابع به ازاي اعداد مثبـت عـدد 1 و بـه ازاي اعداد منفي عدد 1- را بر مي گرداند . به ازاي 0 همان عدد 0 خروجي تابع خواهد بود . اين تـابع را روي مـاتريس A اعمـال ميكنيم :

>>sign(A)

ans= -1 -1 -1 -1 1 1 1 1

 

نویسنده: پور مقدس

 

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