20251117

lab3/exercise3_1.m

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+% 第一题
+
+A=[3,4,-7,-12;5,-7,4,2;1,0,8,-5;-6,5,-2,10];
+B=[4;-3;9;-8];
+% 系数矩阵的秩
+rank(A)
+% 方程的解
+C = A\B

lab3/exercise3_2.m

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+% 练习3 第二题
+x=-10:1:10;
+y=-10:1:10;
+[X,Y]=meshgrid(x,y);
+Z=sin(sqrt(X.^2+Y.^2))./(sqrt(X.^2+Y.^2));
+surf(X,Y,Z)

lab3/exercise3_3.m

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+num=[1];
+den=[1 2 2 1];
+sys=tf(num,den);
+figure(1); pzmap(sys); title('零极点图');
+figure(2); impulse(sys);
+w=0:0.1:10*pi;
+figure(3); freqs(num,den,w)

lab3/exercise3_4.m

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+subplot(2,2,2);
+x=-pi/2:pi/10:pi/2;
+y=sqrt(cos(x));
+plot(x,y);
+subplot(2,2,3);
+x=-2:0.1:2;
+y=-4:0.1:4;
+[x,y]=meshgrid(x,y);
+z=x.^2/4+y.^2/16;
+surf(x,y,z)

lab3/lab3.m

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+% 实验3
+% 读取数据
+[filename1,p1]=uigetfile('*.txt', '选择尼康全站仪坐标文件名');
+fp=fopen(strcat(p1,filename1),'r');
+i=1;bss=[];
+while ~feof(fp)
+    line=fgetl(fp);
+    data=findstr(line,',');
+    bss(i).dh=line(1:data(1)-1); 
+    bss(i).x=str2num(line(data(1)+1:data(2)-1));
+    bss(i).y=str2num(line(data(2)+1:data(3)-1));
+    bss(i).h=str2num(line(data(3)+1:data(4)-1));
+    bss(i).dm=line(data(4)+1:end);
+    i=i+1;
+end
+fclose(fp);
+
+% 计算国家坐标系的坐标
+a=3976223.453;b=39512553.524;rad=deg2rad(0.433267);
+c=cos(rad);d=-sin(rad);lmd=1.000034336;
+m=i-1;gjzb=[]; 
+for i=1:m
+    gjzb(i).dh=bss(i).dh;
+    gjzb(i).dm=bss(i).dm;
+    gjzb(i).h=bss(i).h;
+    gjzb(i).x=a+lmd*(c*bss(i).x-d*bss(i).y);
+    gjzb(i).y=b+lmd*(d*bss(i).x+c*bss(i).y);
+end
+
+% 输出数据
+[filename2,p2]=uigetfile('*.txt', '输出文件');
+fn=fopen(strcat(p2,filename2),'w');
+fprintf(fn,'%s\n\n','   点名       X(m)        Y(m)     H(mm)   code');
+fclose(fp);fn=fopen(strcat(p2,filename2),'a');
+for i=1:m
+    fprintf(fn,'%8s', gjzb(i).dh);
+    fprintf(fn,'%15.3f', gjzb(i).x);
+    fprintf(fn,'%16.3f', gjzb(i).y);
+    fprintf(fn,'%10.3f', gjzb(i).h);
+    fprintf(fn,'%8s\n', strcat('   ',gjzb(i).dm));
+end
+fclose(fn);

lab3/nikon.txt

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+3,49510.3110,80362.3190,405.8240,s50
+63,49488.9080,80426.0080,408.8490,S77
+164,49461.2960,80462.3610,408.9950,S77
+165,49457.2500,80485.8770,409.4490,S81
+166,49476.6650,80395.8870,408.1090,S66
+167,49475.1380,80398.7300,408.1570,S77
+298,49465.2360,80593.9700,415.1290,S99

lab3/zhuanhuan.txt

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+   点名       X(m)        Y(m)     H(mm)   code
+
+       3    4026749.416    39592285.024   405.824     s50
+      63    4026728.820    39592348.981   408.849     S77
+     164    4026701.670    39592385.683   408.995     S77
+     165    4026697.922    39592409.249   409.449     S81
+     166    4026716.196    39592319.017   408.109     S66
+     167    4026714.706    39592321.879   408.157     S77
+     298    4026707.277    39592517.236   415.129     S99