why do i get NaN?

2017 11 5
1 个回答
更新时间：2017 11 5
3 次查看（30 天）

0 个投票

b, z numbers come out but from there onwards e, w, j, k, t and the others leave NaN why?
b=(str2double(get(handles.edit12,'string'))-str2double(get(handles.edit10,'string')))/(str2double(get(handles.edit11,'string'))-str2double(get(handles.edit8,'string')))
z=(str2double(get(handles.edit14,'string'))-str2double(get(handles.edit12,'string')))/(str2double(get(handles.edit13,'string'))-str2double(get(handles.edit11,'string')))
e=(str2double(get(handles.edit16,'string'))-str2double(get(handles.edit14,'string')))/(str2double(get(handles.edit15,'string'))-str2double(get(handles.edit13,'string')))
w=(str2double(get(handles.edit18,'string'))-str2double(get(handles.edit16,'string')))/(str2double(get(handles.edit17,'string'))-str2double(get(handles.edit15,'string')))
j=(str2double(get(handles.edit20,'string'))-str2double(get(handles.edit18,'string')))/(str2double(get(handles.edit19,'string'))-str2double(get(handles.edit17,'string')))
k=(z-b)/(str2double(get(handles.edit13,'string'))-str2double(get(handles.edit18,'string')))
t=(e-z)/(str2double(get(handles.edit15,'string'))-str2double(get(handles.edit11,'string')))
l=(w-e)/(str2double(get(handles.edit17,'string'))-str2double(get(handles.edit13,'string')))
n=(j-w)/(str2double(get(handles.edit19,'string'))-str2double(get(handles.edit15,'string')))
b0=str2double(get(handles.edit10,'string'))
y=b0+b*(x-str2double(get(handles.edit8,'string')))+k*(x-str2double(get(handles.edit8,'string')))*(x-str2double(get(handles.edit11,'string')))

4 个评论
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Erwin Avendaño
Erwin Avendaño 2017-11-5
The method is interpolation of newton
Image Analyst
Image Analyst 2017-11-5
Post a screenshot of your GUI so we can see what numbers you've typed into the edit fields.
Erwin Avendaño
Erwin Avendaño 2017-11-5
wait a moment please a curious fact is that I did the operations with my calculator and I do not leave a division of 0/0 I get a number

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回答（1 个）

Walter Roberson
Walter Roberson 2017-11-5

0 个投票

I recommend doing each str2double only once and assign each to a meaningful variable name and then do the calculations. You can examine the variables to see if you got any nan, which is possible if the corresponding string did not represent a scalar double. You can also get nan from 0/0

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Erwin Avendaño
Erwin Avendaño 2017-11-5
What do you mean by a significant variable name? I did the calculations with a manual calculator and it does not give me a 0/0 gives me a number is what I do not understand is curious because the first two if they give me a number as I mentioned before but from then on e, w, j give me NaN
Walter Roberson
Walter Roberson 2017-11-5
What you posted does not tell us what is stored in the strings. Show us the result of get() of each of the handles used in the formula
Erwin Avendaño
Erwin Avendaño 2017-11-5
It is solving a problem with my program that I check several times that it was fine so I tried another problem and this one if I solved it well and if no mistake no longer told me NaN thank you

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