Not enough input arguments

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BG88
BG88 2018-9-26
评论： madhan ravi 2018-9-26
I am new to Matlab and I am currently getting a problem that I do not have enough input arguments.
The code is as follows:
function P = Antoine(T,A,B,C) % vapour pressure [bar]
T = input('Temperature of water in degrees celcius = ')
T_k = 273.15 + T;
P = 10^(A - (B/(T_k + C))); % temperature [K]
if (0 < T) & (T <= 30)
A = 5.40221;
B = 1838.675;
C = -31.737;
end
if (30 < T) & (T <= 60)
A = 5.20389;
B = 1733.926;
C = -39.485;
end
if (60 < T) & (T <= 90)
A = 5.0768;
B = 1659.793;
C = -45.854;
end
end

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回答（2 个）

madhan ravi
madhan ravi 2018-9-26
编辑：madhan ravi 2018-9-26
function P = Antoine(T,A,B,C) % vapour pressure [bar]
T = input('Temperature of water in degrees celcius = ')
T_k = 273.15 + T;
if (0 < T) & (T <= 30)
A = 5.40221;
B = 1838.675;
C = -31.737;
P = 10^(A - (B/(T_k + C))); % temperature [K]
elseif (30 < T) & (T <= 60)
A = 5.20389;
B = 1733.926;
C = -39.485;
P = 10^(A - (B/(T_k + C))); % temperature [K]
elseif (60 < T) & (T <= 90)
A = 5.0768;
B = 1659.793;
C = -45.854;
P = 10^(A - (B/(T_k + C))); % temperature [K]
end
end
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2018-9-26
The same formula is used for P each time in the code, so you might as well put the P calculation after the if tree.
However, be careful: if the use enters a non-positive T or a T > 90, then the code does not assign a value to P (or to the coefficients needed to calculate P)
madhan ravi
madhan ravi 2018-9-26
Thank you sir , the reason I put P in each tree is that I thought it might reduce the computational time.

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Basil C.
Basil C. 2018-9-26
编辑：Basil C. 2018-9-26
The code you have written is correct all that you need to do is to define the variable P after you have defined the value of A,B,C,T (that is at the end of the if statements)
Also no need to use function P = Antoine(T,A,B,C) rather use function P = Antoine() as the arguments that are passed are not used to compute the value of P as they get overwritten
function P = Antoine() % vapour pressure [bar]
T = input('Temperature of water in degrees celcius = ');
T_k = 273.15 + T;
if (0 < T && T <= 30)
A = 5.40221;
B = 1838.675;
C = -31.737;
end
if (30 < T && T <= 60)
A = 5.20389;
B = 1733.926;
C = -39.485;
end
if (60 < T && T <= 90)
A = 5.0768;
B = 1659.793;
C = -45.854;
end
P = 10^(A - (B/(T_k + C))); % temperature [K]
end

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