what is different between fget1 and fread ?

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yanjie qi
yanjie qi 2016-3-2
编辑： Walter Roberson 2016-3-6
path='F:\多光谱材料\2\2.hdr';
>> fnm='2.hdr';
>> I=enviread(path,fnm);
??? Error using ==> fgetl at 44
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in ==> enviread>read_envihdr at 190
line = fgetl(fid);
Error in ==> enviread at 16
info=read_envihdr(hdrfile);

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Mohammad Abouali
Mohammad Abouali 2016-3-2
编辑：Mohammad Abouali 2016-3-2
I don't think enviread is a function provided by mathworks. It appears it is something that users have provided.
Try multibandread() function of matlab to read ENVI files. I use this function when I am reading ENVI files and it works very well. If you want some instruction on how to use it to read ENVI files, the following is a good resource.
http://www.ehu.eus/ccwintco/uploads/d/dc/LoadHypercubesMatlab.pdf
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yanjie qi
yanjie qi 2016-3-5
编辑：Walter Roberson 2016-3-6
SIR,
I want to convert the data(2-array ) into an image? but the elements are too many, can you give me some suggestions, appreciate on it

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Jan
Jan 2016-3-2
Do not overwrite the important Matlab function path with a variable. Although this will not be the reason of the error, it is a bad idea and might cause severe problems during debugging.
The error means, that the file could not be opened. Most likely the file or folder name is not correct.
I do not see a relation between the error message and the title "difference between fget1 and fread". As the docs explain, fgetl reads a complete line from a text file, while fread reads a specified number of elements from a text or binary file in a specified format.
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yanjie qi
yanjie qi 2016-3-3
thank you, sir
I know that path is a matlab variable, this is not the main error.I tried to put .hdr .raw and M file togeter,and ran it. This time it with such error, I will show you :
??? Undefined function or method 'fget1' for input arguments of type 'double'.
Error in ==> enviread>read_envihdr at 190 line = fget1(fid);
Error in ==> enviread at 16 info=read_envihdr(hdrfile);
also I load the original file.
Jan
Jan 2016-3-3
编辑：Jan 2016-3-3
Do you see, that your command is called "fetg1" with a trailing "one" not an lower-case "L"? The attached code uses "fgetl" with an L. So you error message does not match the code - please do not confuse the readers with such jokes.
The code is instable. The comparison " if varargin{2}=='date' " will fail with an error, if the 2nd input does not have 4 characters. Use this instead:
if strcmp(varargin{2}, 'date')
The eval s are such ugly!
eval(['info.',param,' = ''',value,''';'])
What about:
info.(param) = value;

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