error using open, too many input arguments. error in fopen
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I have a m.file which looks something like this.
for p = 1:2
if p==1
[data,txt,raw]=xlsread('subject_1.xlsx');%%this is reading file of subject 1
fid4=fopen('new_1_datafile.dat','w');
end
if p==2
[data,txt,raw]=xlsread('subject_2.xlsx'); %%%%%%reading file of subject 2
fid4=fopen('new_2_datafile.dat','w')'
end
...
...
%%%written fid1,fid2,fid3 datafiles
...
...
...
%%%there are lots of lines where i calculate different things for each subjects (there are 72 different %%%subjects but for simplicity i am just trying with 2).
fprint(fid4,.......) %%%printing out some important data
fclose(fid1)
fclose(fid2)
fclose(fid3)
fclose(fid4)
end
how can i make sure the fid4 file for the first subject is cleared before writing fid4 file for the second subject? With the above code, I am getting an error message which says, 'error using open, too many input arguments'. The error shows in line 8 when opening fid4 for second subject. So I think it is because I am opening the same file again for the second subject which has been already written for the first subject. But I have allocated different datafile name for the fid4 files for the 2 subjects. Why am I getting this error?
采纳的回答
dpb
2015-8-25
"error using open, too many input arguments'." clearly is bogus as an error message for fopen.
Note above it says "open" not "fopen" which means likely means there's actually a call to function open which indeed does only accept a single argument and the actual line you executed wasn't the one in the code above but something like--
fid4=open('new_2_datafile.dat','w');
NB. also above you've got a conjugate transpose operator at the end of the statement instead of a semicolon--that won't hurt anything from an operational standpoint; just echo the value and return the complex conjugate of a positive integer which is the same as the integer. I don't know what that might do in lastest releases wherein a file handle is an object instead of just a double...
Anyway, make sure you really have fopen everywhere and try again...if it fails again, post the whole error in context with the calling routine, but I'll bet you've got a typo in the m-file you executed.
2 个评论
Pree
2015-8-25
Walter Roberson
2015-8-25
It helps when you post the actual code, especially the code at the line that is creating the error, together with the complete error message.
更多回答（1 个）
Hussain Baloch
2018-12-7
0 个投票
open system ('PV50')
nvals = 0;
figure
for gval=0.2:0.2:1
nvals=navals+1;
gvalsStr-num2Str(oval,3);
set_param('PV50/G1','Gain',gvalStr);
sim('PV50');
plot(v,i);
hold on
end
hold off
this is not working pls help urgently
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