what does == mean in script

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Benjamin Garvin
Benjamin Garvin 2013-11-20
评论： Benjamin Garvin 2013-11-20
hi im writing a piece of script for course work and would like comment each of the lines that i have used, could you help me and tell me what using == does when putting it into my script,
Thanks
Ben
N=-1:5;% sets the values on the x axis I want to use
x1=[1 2 2 1 4 0 0];
for n=1:7
if n==1
y1(1,n)=x1(1,n);
else y1(1,n)=x1(1,n)+y1(1,n-1);
end
end
stem(N,y1)

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-20
a==b
returns 1 if a and b are equal, it returns 0 if not. type
1==4 % check the result
4==4 % check the result
Image Analyst
Image Analyst 2013-11-20
It's used to compare two variables (numbers, arrays, etc.) and say whether they match or not. This is different than a single = sign, which is an assignment. In a==b you'll get a single true or false value, or an array of them if a and b are arrays. In a=b, you're taking the value of b and stuffing it into a, overwriting any prior value that a had, or creating a brand new variable a if no variable by that name existed yet.

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