How to display error using error function?
显示 更早的评论
I have a program that computes thermal conductivity based on an input of a certain alloy and temperature. I would like to have the function display an error if the wrong alloy is inputted. Would It be possible to do this with the error function? This is the code I have so far.
function k = ThCond(alloy,T) % T = input temperature
k = zeros(1,numel(T));
for a = 1:numel(T)
if (298 <= T(a)) && (T(a) <= 840) && strcmp(alloy,'Al2')
k(a) = 149.7 + 0.0809.*T(a) - (1.*10^(-4)).*(T(a).^2);
elseif (298 <= T(a)) && (T(a) <= 773)
k(a) = 76.64 + 0.2633.*T(a) - (2.*10^(-4)).*(T(a)^2);
end
if (293 <= T(a)) && (T(a) <= 890) && strcmp(alloy,'Al3')
k(a) = 124.7 + 0.56.*T(a) + (1*10^(-5)).*(T(a)^2);
end
if (100 <= T(a)) && (T(a) <= 1200) && strcmp(alloy,'Cu1')
k(a) = 453.9 - 0.1054.*T(a);
end
if (460 <= T(a)) && (T(a) <= 1188) && strcmp(alloy,'Cu2')
k(a) = 140.62 + (112.14.*10^(-4)).*T(a);
end
if T(a) <= 1443 && strcmp(alloy,'Cu3')
k(a) = 16.041 + (438.9.*10^(-4)).*T(a);
end
if (400 <= T(a)) && (T(a) <= 1000) && strcmp(alloy,'St1')
k(a) = 76.63 - 0.0459.*T(a);
end
if (298 < T(a)) && (T(a) < 1573) && strcmp(alloy,'St2')
k(a) = 6.31 + ((27.2.*10^(-3)).*T(a)) - (7.*10^(-6)).*(T(a).^2);
end
if T(a) <= 1727 && strcmp(alloy,'St3')
k(a) = 20 + (61.5.*10^(-4)).*T(a);
end
end
end
3 个评论
Wick
2018-5-1
An error will break out of the routine and stop execution. A warning will display text to the command window but keep going. Generally, it's most graceful to use a warning followed by a return command as the exit to a subroutine that fails to execute. Will this work for you?
Porgs
2018-5-1
Walter Roberson
2018-5-1
error('Alloy must be H2SO4 or CuTi2C6H8') ;
采纳的回答
Wick
2018-5-1
Simple enough then.
err = 'This is an error message.'; % perhaps something a bit more descriptive
error(err);
更多回答（3 个）
Porgs
2018-5-1
0 个投票
1 个评论
Wick
2018-5-1
That's literally what the 'error' function does. It displays an error and breaks execution (unless it's part of a try,catch structure). So you'd put it as the result of an 'else' statement or possibly as result of an 'otherwise' option in a switch,case structure.
If you you don't want an actual error message and just want text displayed to the screen you can use the 'disp' or 'warning' commands instead.
usha shree
2019-8-9
0 个投票
one dimesional error with two elements
1 个评论
Walter Roberson
2019-8-12
Could you expand upon that remark?
类别
在 帮助中心 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
