bisector method help and inputs

2021 1 23
1 个回答
更新时间：2021 1 24
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Hello,
I'd like some help with my bissector method as it displays an error message each time I run it.
Error using APFunction
Too many input arguments.
Error in test2 (line 12)
[deflectionL,tL]= APFunction (PForceL,c,k,LoadingDurationL,tstep);
clc;clear;
c=800; k=5000000;
xL=0; xU= 10; Diff=1;
tstep=0.01;
while Diff > 0.01
xM = (xU-xL)/2;
[PForceL,LoadingDurationL] = myfunction(xL);
[PForceU,LoadingDurationU] = myfunction(xU);
[PForceM,LoadingDurationM] = myfunction(xM);
[deflectionL,tL]= APFunction (PForceL,c,k,LoadingDurationL,tstep);
[deflectionU,tU]= APFunction (PForceU,c,k,LoadingDurationU,tstep);
[deflectionM,tM]= APFunction (PForceM,c,k,LoadingDurationM,tstep);
MaxdL= max(deflectionL);
MaxdU= max(deflectionU);
MaxdM= max(deflectionM);
if MaxdM >0.1
xL=xM;
else
xU=xM;
end
Diff = abs(MaxdM-0.1);
end

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回答（1 个）

Steven Lord
Steven Lord 2021-1-23

0 个投票

You haven't showed the code for your APFunction, so all we can say is that you're calling it with five input arguments and it must be defined to accept fewer than five inputs.

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henry Jok
henry Jok 2021-1-23
Hello, yes sorry here it is.
function [z]= APFunction (c,k,x)
[F,td] = myfunction(x);
w=sqrt(k/c);
k=k*1e6;
period = (2*pi) / w;
dt = period/1000;
tmax = 2*period;
t=0:dt:tmax;
% period 1 : t <= Td
t1 = t(t<=td);
z1= (F/k)*(1-cos(w*t))+(F/(k*td)*((sin(w*t)/w)-t));
% period 2 : t > Td
t2 = t(t>td);
z2=(F/(k*w*td))*(sin(w*t)-sin(w*(t-td)))-((F/k)*cos(w*t));
z = max([z1,z2]);
z= z*1000000;
end
Steven Lord
Steven Lord 2021-1-24
Here's how you're calling your function in your original code.
[deflectionL,tL]= APFunction (PForceL,c,k,LoadingDurationL,tstep);
Here's how the function is declared.
function [z]= APFunction (c,k,x)
The value stored in PForceL in the caller workspace will be assigned to the variable c in the workspace of this call to APFunction. Simillarly c in the caller workspace will be assigned to k in the workspace of this APFunction call and k in the caller will be assigned to x in the APFunction workspace.
LoadingDurationL arrives at the front desk to the APFunction hotel and asks for a room only for the desk clerk, MATLAB, to tell them "Sorry, no vacancies." There are only three rooms at the APFunction hotel.
Even if you fixed that, you'd have a problem at check-out time. The valet only has one car in the garage, but two guests want to pick up their vehicles when they leave the APFunction hotel.
I recommend writing up help text for your APFunction and/or using more descriptive variable names, to make it clearer how you expect users of your code to call it. How many inputs and outputs does APFunction expect / require and what do those inputs / outputs represent? Then update your test2 script to call it according to those expectations.

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