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why do i get NaN?

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Erwin Avendaño
Erwin Avendaño 2017-11-5
评论： Erwin Avendaño 2017-11-5
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')))
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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
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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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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