SWITCH expression must be a scalar or string constant 出错请教

jingrenzhi

我编了一个滤波器的程序,出现下列问题,请各位帮忙改改!谢谢!
程序:
     clear;
clc;
close all hidden;
fni=input('wenjian:','s');
fid=fopen(fni,'r');
fs=fscanf(fid,'%f',1);
fun=fscanf(fid,'%d',3);
mod=fscanf(fid,'%d',1);
if fun<=2
    wp=fscanf(fid,'%f',1);
    ws=fscanf(fid,'%f',1);
else
    wp=fscanf(fid,'%f',2);
    ws=fscanf(fid,'%f',2);
end
rp=fscanf(fid,'%f',1);
rs=fscanf(fid,'%f',1);
fno=fscanf(fid,'%s',1);
x=fscanf(fid,'%f',[1,inf]);
status=fclose(fid);
switch fun
    case 1
        ft='low';
    case 2
        ft='high';
    case 3
        ft='bandpass';
    case 4
        ft='stop';
    otherwise
        ft='low';
end
switch mod
    case 1
        [n wn]=buttord(wp/(fs/2),ws/(fs/2),rp,rs);
        [b a]=butter(n,wn,ft);
    case 2
        [n wn]=cheb1ord(wp/(fs/2),ws/(fs/2),rp,rs);
        [b a]=cheby1(n,rp,wn,ft);
    case 3
        [n wn]=cheb2ord(wp/(fs/2),ws/(fs/2),rp,rs);
        [b a]=cheby2(n,rs,wn,ft);
    case 4
        [n wn]=ellipbuttord(wp/(fs/2),ws/(fs/2),rp,rs);
        [b a]=ellip(n,rp,rs,wn,ft);
end
出现的问题:
   ??? SWITCH expression must be a scalar or string constant.

Error in ==> filterwo2 at 33
switch mod

谢谢各位!

[ 本帖最后由 eight 于 2007-9-15 10:25 编辑 ]

zhangnan3509

这是不是王济那本书上的程序？

jingrenzhi

不知道,是朋友给的!

jingrenzhi

有啥问题吗?我也没有看明白!是同学的!

zhj0231984

能不能把你要导入的文件也附上来啊~~~

jingrenzhi

你好,我想问的是设计带通滤波器,频率需要设置成二元向量,在matlab程序中怎么设置?我不会用附件形式传上来!你帮忙看一下!
我的数据是
"3.438134e-02
1.299897e-02
4.898164e-03
1.639001e-02
7.629832e-03
-1.525966e-02
-8.195004e-03
1.789714e-02
1.752036e-02
8.948568e-03
1.120926e-02
1.902748e-02
3.061352e-02
2.486760e-02
1.309317e-02
2.015783e-02
2.128817e-02
5.463337e-03
2.825864e-03
1.836811e-02
2.985996e-02
7.441441e-03
-1.535386e-02
-8.289200e-03
4.898164e-03
4.332991e-03
-8.948568e-03
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1.573064e-02
3.579427e-03
-5.274945e-03
6.499487e-03
1.309317e-02
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0.000000e+00
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5.651727e-03
-3.767818e-04"

songzy41

从程序和数据来看，是楼主给出的数据格式和程序不配。在程序中要从数据文件读入：
fni=input('wenjian:','s');
fid=fopen(fni,'r');
fs=fscanf(fid,'%f',1);
fun=fscanf(fid,'%d',3);
mod=fscanf(fid,'%d',1);
if fun<=2
    wp=fscanf(fid,'%f',1);
    ws=fscanf(fid,'%f',1);
else
    wp=fscanf(fid,'%f',2);
    ws=fscanf(fid,'%f',2);
end
rp=fscanf(fid,'%f',1);
rs=fscanf(fid,'%f',1);
fno=fscanf(fid,'%s',1);
x=fscanf(fid,'%f',[1,inf]);
fs, fun, mod, wp,ws, rp, rs, fno和x，但楼主的数据文件只给出x的数据。

stephenhope

发这么长的数据 好像水贴一样

呵呵 飘过

eight

原帖由 jingrenzhi 于 2007-9-14 15:53 发表

                               
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我编了一个滤波器的程序,出现下列问题,请各位帮忙改改!谢谢!
程序:
     clear;
clc;
close all hidden;
fni=input('wenjian:','s');
fid=fopen(fni,'r');
fs=fscanf(fid,'%f',1);
fun=fscanf(fid,'%d' ...

先看看 switch 函数的用法，然后自己设置断点调试一下

ps：下次贴数据请使用附件，这样直接贴上来阅读不方便

jingrenzhi

谢谢,我也是刚开始学习matlab,很多地方不懂,以后多指教!:@)

jingrenzhi

你好,我想问的是设计带通滤波器,频率需要设置成二元向量,在matlab程序中怎么设置?

jingrenzhi

你好!你说的"王济的书"是本啥样的书?书名是啥?