Columns 8 through while expression {commands} 예제 1.2 (While 반복문의이용 ) >> num=0

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1 for loop array {commands} 예제 1.1 (For 반복변수의이용 ) >> data=[ ; ] data = >> for n=data x=n(1)-n(2) >> for n=1:10 x(n)=sin(n*pi/10); n=10; >> x Columns 1 through 7

2 Columns 8 through while expression {commands} 예제 1.2 (While 반복문의이용 ) >> num=0; EPS=1; >> while (1+EPS) > 1 EPS=EPS/2; num=num+1; >> num num = 53 >> EPS=2*EPS EPS = e-16

3 예제 1.3 (For 와 If 를이용하여 While 문대치하기 ) >> EPS=1; % EPS 를수렴하는또다른방법을보여준다. >> for num=1:1000 EPS=EPS/2; if (1+EPS)<=1 EPS=EPS*2 break % break 는 loop 를빠져나가라는명령문이다. EPS = e-16 >> num num = 53 예제 1.4 ( 반복문의다중이용 ) >> for n=1:5 for m=5:-1:1 A(n,m)=n^2+m^2; >> A A =

4 예제 1.5 ( 반복문의초기화 ) >> clear >> for n=1:10 % 배열의크기가자동으로 1 씩증가한다. x(n) = sin(n*pi/10); >> x=zeros(1,10); % 변수 x 를위한공간을미리할당한다. >> for n=1:10 x(n)=sin(n*pi/10); >> n, x % n 이 1 부터 10 까지, 마지막 문에이를때까지계산한다. n = 10 Columns 1 through Columns 8 through 예제 1.6 (Loop 이용법보다효율적인배열이용법 ) >> n=1:10; >> x=sin(n*pi/10) Columns 1 through Columns 8 through

5 예제 2.1 ( 단순문자열 ) >> x=-pi:.1:pi; y = sin(x); plot(x, y) >> title('sin(x)'), xlabel('x'), ylabel('y') >> t= How about this character string?' t = How about this character string? >> size(t) 1 32 >> v= I can''t find the manual!' % 문자열안의작은따옴표 (single quote) 는 % 를두번연속으로쓰는것으로나타낸다 v = I can't find the manual! 예제 2.2 ( 문자열의연산 ) >> u=abs(t); u=t+0 % 문자열에 0 을더해도역시 ASCII 표현으로바뀐다 u = Columns 1 through

6 Columns 13 through Columns 25 through >> v=setstr(u) v = How about this character string? >> u=t(16:24) % 문자열의 16 에서 24 번째원소는 character 라는단어이다 u = character >> u=t(24:-1:16) % character 의 spell 을거꾸로나열 u = retcarahc 예제 2.3 ( 문자열의합성 ) >> u= If a woodchuck could chuck wood,'; >> v= how much wood would a woodchuck chuck?'; >> w=[u v] w = If a woodchuck could chuck wood, how much wood would a woodchuck chuck? >> v=[ Character strings having more than ' one row must have the same number ' of columns just like matrices! '] v = Character strings having more than one row must have the same number of columns just like matrices! >> a= one' ; b= two' ; c= three' ; >> disp(str2mat(a, b, c, four')) % char() instead of str2mat() one two

7 three four 예제 2.4 ( 문자열변환 ) >> disp(u) If a woodchuck could chuck wood, >> i=find(u>= a' & u<= z'); % find is a very powerful function! >> u(i)=setstr(u(i)-( a'- A')) u = IF A WOODCHUCK COULD CHUCK WOOD, >> disp(v) Character strings having more than one row must have the same number of columns just like matrices! >> i=find(v>= a' & v<= z'); % here i is a single index vector into v, >> v(i)=setstr(v(i)-( a'- A')) % and matrix keeps the same orientation. v = CHARACTER STRINGS HAVING MORE THAN ONE ROW MUST HAVE THE SAME NUMBER OF COLUMNS JUST LIKE MATRICES!

8 예제 2.5 ( 숫자와문자열의변환 ) >> rad=2.5; area=pi*rad^2; >> t=[ A circle of radius ' num2str(rad) has an area of '... num2str(area).']; >> disp(t) % 함수 num2str 은숫자를열로바꾸는데사용된다. A circle of radius 2.5 has an area of >> s= [1 2; pi 4]' % a string of a MATLAB matrix s = [1 2; pi 4] >> str2num(s) >> s= 123e+5' % a string containing a simple number s = 123e+5 >> str2num(s)

9 예제 2.6 (printf 명령문 ) >> fprintf( See what this does') See what this does >> fprintf( See what this does\n') % \n 은새줄 (new line) 문자를뜻한다. See what this does >> t=sprintf( A circle of radius %.4g has an area of %.4g.',rad,area); >> disp(t) A circle of radius 2.5 has an area of >> fprintf( A circle of radius %.4g has an area of %.4g.',rad,area) A circle of radius 2.5 has an area of

10 예제 3.1 (input 함수 ) >> t= Enter number of rolls of tape > ' ; >> tape=input(t) Enter number of rolls of tape > 5 tape = 5 >> x=input( Enter anything > ', s') % 's' 는 MATLAB 에게입력값을문자열로서 % output 변수에전달하라는표현이다. Enter anything > anything can be entered anything can be entered 예제 3.2 (eval, feval 함수 ) >> a=eval( sqrt(2)') a = >> eval( a=sqrt(2)') % eval 함수를사용하는두가지경우의방법 a = >> eval( a=sqrtt(2), a=[]') % sqrtt 는 MATLAB 함수로유효하지않다. a = [] >> a=feval('sqrt',2) a =

11 예제 3.3 (findstr 함수 ) >> b = Peter Piper picked a peck of pickled peppers'; >> findstr(b, ') % find spaces >> findstr(b, p') % find the letter p >> find(b== p') % for single character searches the find command works too

12 >> findstr(b, cow') % find the word cow [] >> findstr(b, pick') % find the string pick 예제 3.4 (strrep 함수 ) >> strrep(b, p', P') % capitalize all p's Peter PiPer Picked a Peck of Pickled PePPers >> strrep(b, Peter', Pamela') % change Peter to Pamela Pamela Piper picked a peck of pickled peppers 예제 3.5 (strtok 함수 ) >> disp(b) Peter Piper picked a peck of pickled peppers >> strtok(b) % find first token in above string separated by whitespace Peter >> [c,r]=strtok(b) % return the remainder of the string array in r c = Peter r = Piper picked a peck of pickled peppers >> [d,s]=strtok(b, pp') % let delimiter be lower or uppercase P d = eter s = Piper picked a peck of pickled peppers

13 Degree= 60 is Radian= 1.05 Degree=120 is Radian= Degree=600 is Radian=10.47

예제 1.1 ( 관계연산자 ) >> A=1:9, B=9-A A = B = >> tf = A>4 % 4 보다큰 A 의원소들을찾을경우 tf = >> tf = (A==B) % A

예제 1.1 ( 관계연산자 ) >> A=1:9, B=9-A A = 1 2 3 4 5 6 7 8 9 B = 8 7 6 5 4 3 2 1 0 >> tf = A>4 % 4 보다큰 A 의원소들을찾을경우 tf = 0 0 0 0 1 1 1 1 1 >> tf = (A==B) % A 의원소와 B 의원소가똑같은경우를찾을때 tf = 0 0 0 0 0 0 0 0 0 >> tf