fprint error

Itry process multiple data..sometimes, my programming working..but,when i want to repeat processing, appear error like below..can someone help me to solve this error

??? Error using ==> fprintf Function is not defined for 'struct' inputs.

Error in ==> Dailystep2 at 154 fprintf(fid,'\n%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f\n',LAT,LON,ug,vg,dir,v,EKE,he1);

Answer 1

[Image Analyst]

You need to specify particular fields in your struct, like ug.field1, vg.field42, v.myField, or whatever...

Answer 2

[Geoff]

Like the error message says, some of your inputs are structs, and that's not allowed. Run the following code to check the types that you are passing to fprintf:

cellfun( @class, {LAT,LON,ug,vg,dir,v,EKE,he1}, 'uni', 0 )

[joo tan]

cellfun( @class, {LAT,LON,ug,vg,dir,v,EKE,he1}, 'uni', 0 )

ans =

'double' 'double' 'double' 'double' 'struct' 'double' 'double' 'double'

this is the answer..can you give me solution

[joo tan]

i think, it has problem with "dir"..because some data, the value is "NaN"..

if(ug>0)& (vg<0);

dir=90+(atand(abs(vg)/abs(ug)));

else

if (ug<0)& (vg>0);

dir=270+(atand(abs(vg)/abs(ug)));

else

if (ug<0)& (vg<0);

dir=270-(atand(abs(vg)/abs(ug)));

else

if (ug>0)&(vg>0);

dir=90-(atand(abs(vg)/abs(ug)));

else

if (isnan(hd1)) || (isnan(hd2));

dir=NaN;

end

end

end

end

end

[Geoff]

Like walter said, don't use 'dir'. The problem here I think is that you do not guarantee that your variable will have a value. When you used 'dir', it wasn't so obvious because it just called the function instead of using the overridden variable name. You need something to fall back on. It seems like you use NaN for this purpose, but if ug and vg are both zero, and neither hd1 nor hd2 are NaN, you currently do not give 'd' any value.

Answer 3

[joo tan]

this is my programming..i am very dispointed when my programming not working like before..plz..help me

cd('E:\Data2\Gridfile');
files = dir('*.TXT');
for i=1:numel(files);
    %for i=1:10
% option n = [files(i).name '-ascii']
n2 = [files(i).name];

fid=fopen(n2) ; % the original file
f = load(files(i).name);
P=n2;
N='FILE1.txt';
M='FILE2.txt';
M1='FILE3.txt';

R=6371000;
 pi=7.27*(10^-5);
 g=9.8;
for ii=226:225:16651 ;
for j=450:225:16875;
Lat=f(ii:j,1);
Lon=f(ii:j,2);
SLA1=f(ii:j,3);

   end

for l=1:223;
LON1=Lon(l,1);
LON2=Lon(l+2,1);  
h1=SLA1(l,1);
h2=SLA1(l+2,1);
he=SLA1(l+1,1);
fid=fopen(N,'a');   
fprintf(fid,'\n%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f\n',LON1,LON2,h1,h2,he);
fclose(fid);
end
end

for k=1:225:16426;
for n=225:225:16650;   
Lat=f(k:n,1);
SLA2=f(k:n,3);
end

for l=1:223;

LAT1=Lat(l+1,1);
h3=SLA2(l+1,1);
fid=fopen(M,'a');   
fprintf(fid,'\n%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f\n',LAT1,h3);
fclose(fid);
end 
end

for k1=451:225:16876;
for n1=675:225:17100;   
Lat=f(k1:n1,1);
SLA3=f(k1:n1,3);
end

for l=1:223;

LAT2=Lat(l+1,1);
h4=SLA3(l+1,1);
fid=fopen(M1,'a');   
fprintf(fid,'\n%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f\n',LAT2,h4);
fclose(fid);
end 
end

F1 = load(N);
F2 = load(M);
F3 = load(M1);
for I=1:16502;
Stn=(I);
format LONG

lat1=F2(Stn,1);
lat2=F3(Stn,1);
lon1=F1(Stn,1);
lon2=F1(Stn,2);
he1=F1(Stn,5);
h11=F1(Stn,3);
h22=F1(Stn,4);
h33=F2(Stn,2);
h44=F3(Stn,2);

if h11~=NaN && h22~=NaN;
h12=h22-h11; 
else
h12=NaN;
end
if h44~=NaN && h33~=NaN;
   h13=h44-h33 ;
else
  h13=NaN; 
end
if isnan(h12);
    h13=NaN;
end
if isnan(h13);
    h12=NaN;
end
hd1=h12;
hd2=h13;

x1=R*(deg2rad(lon1))*cos(deg2rad(lat1));
x2=R*(deg2rad(lon2))*cos(deg2rad(lat2));
y1=R*(deg2rad(lat1));
y2=R*(deg2rad(lat2));
deltx=x2-x1;
delty=y2-y1;
LAT=(lat1+lat2)/2;
LON=(lon1+lon2)/2;

f = 2*(7.292115*(10^-5))* cos(deg2rad(lat1));
ug = (-1)*(g/f)*(hd2/delty) ;
vg = (g / f )*(hd1/deltx) ;
v=sqrt(ug^2+vg^2);
EKE=(ug^2+vg^2)/2;
%  Derive geostrophic current velocity and direction

if(ug>0)& (vg<0);
dir=90+(atand(abs(vg)/abs(ug)));    
else
if (ug<0)& (vg>0);
dir=270+(atand(abs(vg)/abs(ug)));  
else
if (ug<0)& (vg<0);
dir=270-(atand(abs(vg)/abs(ug)));    
else
if (ug>0)&(vg>0);   
dir=90-(atand(abs(vg)/abs(ug))); 
else
    if (isnan(hd1)) || (isnan(hd2));
        dir=NaN;
    end
end
end
end
end

cd('E:\Data2\Gridfile\Result');

fid=fopen(P,'a');   
%fprintf(fid,'\n%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f\n',lat1,lon1,ug,vg,dir,v);
fprintf(fid,'\n%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f%15.6f\n',LAT,LON,ug,vg,dir,v,EKE,he1);

fclose(fid);
end

cd('E:\Data2\Gridfile');
delete(N);
delete(M);
delete(M1);
end

Answer 4

[Walter Roberson]

Do not use "dir" as a variable name, as it conflicts with the function name "dir".

There are circumstances under which your if/else structure might not set the variable named "dir", so when your code tries to reference the unset variable "dir" it instead gets the function named "dir", runs that function which returns a structure...

"dir" as a variable can end up not being set if vg or ug come out as exactly 0, because you use < 0 and > 0 and do not consider exactly equal to 0.

[joo tan]

i already try to chande the dir ..i use 'd'..but still not working

[Walter Roberson]

At the point it fails, what does fieldnames(d) report?

To check, you replaced the name "dir" with "d" in the fprintf() call as well ?

[Walter Roberson]

Using "elseif" would help prevent all those hanging "end" statements that give the impression to the reader that they should be looking back for a matching "for" loop.

[Geoff]

joo, check the comment in my answer. i suspect you never set a value for 'dir' (or 'd') because your block of if-statements does not handle one specific case, and you don't set the value anywhere else.