Hello guys , please help me ! I

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Dombrovschi Andrei
评论： Star Strider 2018-2-1
I have two vectors :
x= [1 2 3 4 5 6]
and
y=[2.3 4.3 5 4.7 9 12]
and i need to find the value of y in x = 3.5
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Dombrovschi Andrei
Dombrovschi Andrei 2018-2-1
编辑：per isakson 2018-2-1
x= [1 2 3 4 5 6]
y=[2.3 4.3 5 4.7 9 12]
figure
plot(x,y,'r-')
value = xx==3.5(find(y));
hold on
plot(3.5,value,'r*')
per isakson
per isakson 2018-2-1
Isn't that interpolation
>> interp1( x, y, 3.5 )
ans =
4.8500

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回答（2 个）

Star Strider
Star Strider 2018-2-1
It is an interpolation, regardless of the method you want to use. There are likely several ways to do this.
Using interp1:
x = [1 2 3 4 5 6];
y = [2.3 4.3 5 4.7 9 12];
idx = find(x <= 3.5, 1, 'last');
yi = interp1(x(idx:idx+1), y(idx:idx+1), 3.5, 'linear')
yi =
4.8500
If you want to use the 'previous', 'next', or 'nearest' methods instead of 'linear', the results are 5, 4.7, and 4.7 respectively.
Dombrovschi Andrei
thanks guys !

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