Problem of Interpolation in matlab

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addou abdeljalil
addou abdeljalil 2015-7-9
回答： addou abdeljalil 2015-7-9
Hi, My problem are like this: i have a 2 colons of 178 values define UM (Unity Monitor) and angles and i wish to compare one other angle extracted from image dicom to this angle in order to find UM corresponding. i tried interpolation but it doesn't work
% code
UM angle
0 0.5000
1.4700 1.2300
4.3700 3.2800
7.2900 5.2800
for example, if i have angle = 4° what is value of UM corresponding ?
Any help will be appreciate

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Azzi Abdelmalek
Azzi Abdelmalek 2015-7-9
编辑：Azzi Abdelmalek 2015-7-9
A=[0 0.5000
1.4700 1.2300
4.3700 3.2800
7.2900 5.2800]
UM=A(:,1)
angle=A(:,2)
UMi=4
anglei=interp1(UM,angle,UMi)
  1 个评论
addou abdeljalil
addou abdeljalil 2015-7-9
编辑：Azzi Abdelmalek 2015-7-9
Thank you Azzi for your answer. your answer works well for 4 but when I test other larger values it recturn me not correct values. in fact I have two columns that are each 178 lines so when test for example angle = 182° it return me UM = 287 but the reel value is 126.11.

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更多回答（1 个）

addou abdeljalil
addou abdeljalil 2015-7-9
I tested this code but there also some pb.
for i = 1:178
if A(i,2)< angle < A(i+1,2)
UM = interp1(A(i,1),A(i+1,1),angle)
end
end
it return me this error : Error using interp1 (line 182)
There should be at least two data points.

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