An error (Two different outputs for a single command)

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onsagerian 2018-7-9

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评论： onsagerian 2018-7-10

Hello,

When I ran my simple program, there were two different outputs. (Only single value of "gamma" in this case are expected one but I had two values. I have no idea on this part. Would you answer me?

(I am attaching a part of my program)

format long e
C_0=0.1;
T=0.1;
k=2.0;                    %default value is 2.0
k_1=1.0;      %k(-1)      default value is 0.1   (modified: 1.0)
k_2=0.01;     %k(-1*)     
k_(1)=10;     %k'(-1)    default value is 10
k_(2)=1.0;     %k'(-1*)   default value is 1.0
a_p=0.0008;     %k(p)     default value is 0.0002
k_p=0.00001;   %k(-p)         
%theta=k_1/k_(1);
theta=k_2/k_(2);
m=0.0000005;
W=0.002;
gamma=(a_p*k*k_2)./(k_p*m*k_)

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Answer 1

per isakson 2018-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/409365-an-error-two-different-outputs-for-a-single-command#answer_328012

编辑：per isakson 2018-7-9

在 MATLAB Online 中打开

k_ is a row vector, which explains why gamma becomes a row vector

>> whos k_ gamma
  Name       Size            Bytes  Class     Attributes
  gamma      1x2                16  double              
  k_         1x2                16  double

gamma is the name of a built-in function and thus should not be used as the name of a variable.

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onsagerian 2018-7-10

Thank you for your explanation. Actually, I realized I put a wrong format(k_). Anyway, I've learned how to assign a name of variable under certain conditions.

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