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%exm07415_1.m clf,shg t=-pi/2:pi/12:pi/2; %在负90度到正90度区间中，每15度取一点。 r=ones(size(t)); %单位半径 [x,y]=pol2cart(t,r); %极坐标转化为直角坐标 subplot(1,2,1),compass(x,y),title('Compass') subplot(1,2,2),feather(

function varargout = ringzy(r,varargin) %RINGZY Plot a ring and calculate the area of the ring. % r 基圆半径 % 调用格式 % [x1,y1,x2,y2,s1,s2]=ringzy(r,r2,'PropertyName','PropertyValue',...) % （1）无输出

%exm07414_1.m clf;shg n=10; dt=2*pi/n; t=0:dt:2*pi t=[t,t(1)]; x=sin(t);y=cos(t); fill(x,y,'c');axis off equal ht=text(0,0,'\fontname{隶书}\fontsize{32}十边形'); set(ht,'Color','k','HorizontalAlig

/* pizza.c -- uses defined constants in a pizza context */ #include #define PI 3.14159 int main(void) { float area, circum, radius; printf("What is the radius of your pizza?\

% Design filter by specifying delay in units and % looking at mag and phase response % Good default values for fft_size = 128 and num_carriers = 32 delay_1 = 6; % 6 attenuation_1 = 0.35; %

%例35-12：求方向导数。 syms x y z f=x*y^2-x*y*z+z^3; s=jacobian(f) sx=subs(s,'x','1'); sy=subs(sx,'y','1'); sz=subs(sy,'z','2'); g=vpa(sz) a=pi/3; b=pi/3; c=pi/3; L=g*[cos(a),cos(b),cos(c)]'

%例35-12：求方向导数。 syms x y z f=x*y^2-x*y*z+z^3; s=jacobian(f) sx=subs(s,'x','1'); sy=subs(sx,'y','1'); sz=subs(sy,'z','2'); g=vpa(sz) a=pi/3; b=pi/3; c=pi/3; L=g*[cos(a),cos(b),cos(c)]'

%例36-13 三维曲线绘图 t=0:2*pi; x=cos(t).*sin(t); y=2+t; z=t.^2; plot3(x,y,z)

%例23-20 文本框标注 x=0:0.02*pi:2*pi; y=sin(x)+cos(x); plot(x,y,pi,sin(pi)+cos(pi),'o') text(pi,sin(pi)+cos(pi),['sin(\pi)+cos(\pi)=',num2str(sin(pi)+cos(pi))]) gtext({'gtext1-line1','gtext1-line2'})

%例23-5 曲线格式和标记点类型设置 x=0:0.1*pi:2*pi; y3=sin(x).*cos(3*x); y1=sin(x); y2=cos(3*x); plot(x,y1,'ob',x,y2,'--dc',x,y3,':vr') %第一组数据只标记数据点