MATLAB符號用法（1）

MATLAB符號用法（1）

>> a=rand(3,4)

a =

    0.8147    0.9134    0.2785    0.9649

    0.9058    0.6324    0.5469    0.1576

0.1270    0.0975    0.9575    0.9706

1.       數位轉換字串

>> a1=num2str(a,3)

a1 =

0.815     0.913     0.278     0.965

0.906     0.632     0.547     0.158

0.127   0.0975     0.958     0.971

2.       字串轉換為整數

>> a2=str2num(a1)

a2 =

    0.8150    0.9130    0.2780    0.9650

    0.9060    0.6320    0.5470    0.1580

    0.1270    0.0975    0.9580    0.9710

3.       整數轉換字串

>> a3='123456'

a3 =

123456

>> a4=int2str(a3)

a4 =

49        50 51 52 53 54

4.       矩陣轉換為字元

>> a5=mat2str(a,3)

a5 =

[0.815 0.913 0.278 0.965;0.906 0.632 0.547 0.158;0.127 0.0975 0.958 0.971]

5.       字串轉換為矩陣

>> a6='one',a7='two'

a6 =

one

a7 =

two

>> a8=str2mat(a6,a7,'three')

a8 =

one

two

three

6.       連接串

>> z=char('h','o','w','','a','r','e','','y','o','u')

z =

h

o

w

a

r

e

y

o

u

>> z1=strcat(z)

z1 =

h

o

w

a

r

e

y

o

u

7.       垂直連接串

>> s1='i',s2='love',s3='banana'

s1 =

i

s2 =

love

s3 =

banana

>> strvcat(s1,s2,s3)

ans =

i 

love

banana

8.       串比較

>> n1='abc',n2='abcd',n3='abc'

n1 =

abc

n2 =

abcd

n3 =

abc

>> strcmp(n1,n2)

ans =

     0

>> strcmp(n1,n3)

ans =

     1 

9.       比較串前n個字元

>> g1='abcdeg',g2='abcdef'

g1 =

abcdeg

g2 =

abcdef

>> strncmp(g1,g2,3)

ans =

     1

>> strncmp(g1,g2,6)

ans =

     0

10.   在其他串中尋找此串

>> y='i love apple and banana'

y =

i love apple and banana

>> findstr(y,' ')

ans =

     2     7    13    17

11.   串對齊

>> m=char('3','46','754')

m =

3

46

754

>> strjust(m,'center')

ans =

3

46

754

>> strjust(m,'right')

ans =

3

46

754

12.   查找匹配的字串

>> strmatch('x',strvcat('u','v','w','x','y','z'))

ans =

     4

13.   串替代

>> d='mary is beautiful'

d =

mary is beautiful

>> strrep(d,'m','M')

ans =

Mary is beautiful

14.   尋找串中的記號

>> h='you are so great'

h =

you are so great

>> strtok(h)

ans =

you

15.   大寫串

>> i='i need your help'

i =

i need your help

>> upper(i)

ans =

I NEED YOUR HELP

16.   小寫串

>> u='VERY GOOD'

u =

VERY GOOD

>> lower(u)

ans =

very good

17.   空格串

>> l=['i',blanks(2),'miss',blanks(2),'you']

l =

i miss you

18.   刪掉串中空格

>> o='a b c d '

o =

a b c d

>> deblank(o)

ans =

a b c d