The variable "X" might be used before it is defined

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João Carvalho
João Carvalho 2017-10-26
评论： per isakson 2017-10-26
Is something wrong because of that red line? The program can't find that file?
How can I solve this problem? Thanks
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João Carvalho
João Carvalho 2017-10-26
In "g1_land.txt" there are three columns with numbers. It is a lowercase L.
per isakson
per isakson 2017-10-26
I would try to interactively run
data = load( c:\mydata\folder\g1_land.txt', '-ascii' );
with your full file specification in the command window.

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回答（1 个）

OCDER
OCDER 2017-10-26
Using load without an output is essentially "poofing" variables into your function and forcing the rest of the code to "guess" what variable got poofed in. That's what the warning message is telling you: The variable "g1_land" might be used before it's defined.
To fix this:
g1_land = load('g1_land.txt'); %Now, you explicitly told the computer what g1_land is.
"Hey Matlab, I'm importing data into a variable called g1_land,
so no surprises!"
ano1 = g1_land(:, 1);
Note that if g1_land.txt is formatted incorrectly, you'll get other errors. There are other ways to import data, like csvread, dlmread, fscanf, textscan, etc.

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