【求助】关于matlab的几道简单题,求助...

[geoer]

1:
a:
fid=fopen(‘d:\wyt.dat’,,’r+’);
b:
f=2.15678
fid=fopen(‘d:\wyt.txt’,,’at’);
fprintf(fid,'\n%+12.5E\n',f);
fclose(fid);
c:
fid2=fopen('d:\wyt.txt','rt');
B=fscanf(fid2,'%f',inf);
fclose(fid2);
2:
fid=fopen('d:\test.dat','w');
fprintf(fid,'\n NAME SCORE.\n Liuqi 84.0\n Zhangbin 87.5\n…
Liping 90.0\n Wangwei 78.0 \n Wujian 92.5\n ');
fclose(fid);
3:
function test(n)
x=0:0.1:2*n;
y=sin(x).*cos(5*x);
plot(x,y);
end
4:
function test1(n)
x=0:0.1:2*n;
y=abs(1000*sin(4*x))+1;
semilogy(x,y,'-r*');
end
5:
t=-6:0.1:2;
ft=sin(t);
plot(t,ft);

fplot('sin',[-6 2])
6:
function testsurf(n)
[x,y]=meshgrid(0:0.1:2*n);
z=sin(x).*cos(y);
surf(x,y,z);
function testmesh(n)
[x,y]=meshgrid(0:0.1:2*n);
z=sin(x).*cos(y);
mesh(x,y,z);