Error: File: centraldiff.m Line: 1 Column: 11 Unbalanced or unexpected parenthesis or bracket

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TT
TT 2021-2-23
回答： Steven Lord 2021-2-24
function[U(m+1)]=centraldiff(Tn,zeta,U(1),U(2),acc(m),dt)
%Tn=2*pi*sqrt(m/k)
%U(1)=0; % displacement at point t=0 of SDOF
%V(1)=0; % velocity at point t=0 of SDOF
%zeta=0.05;
%Tn=2.5
%U(2)=0;
for m=2:20;
U(m+1)=-acc(m)/(1/dt^2+2*pi*zeta/Tn*dt)+((-1/dt^2+2*pi*zeta/Tn*dt)/(1/dt^2+2*pi*zeta/Tn*dt))*U(m-1)+((-4*pi^2/Tn^2+2/dt^2)/(1/dt^2+2*pi*zeta/Tn*dt))*U(m)
end
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TT
TT 2021-2-23
when evaluating function it gives Error: File: centraldiff.m Line: 1 Column: 11 Unbalanced or unexpected parenthesis or bracket. What is the error

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Steven Lord
Steven Lord 2021-2-24
When you define your function, the function declaration line should include the names of the variables into which the input arguments will be stored. It cannot contain expressions like U(1) or U(m+1).
When you call your function, specify the exact values on which you want your function to operate. The call can contain expressions.
This is an incorrect way to define the addme function:
function z = addme(2, 3)
z = 2+3;
end
This is a correct way to define the addme function:
function z = addme(x, y)
z = x + y;
end
and these are correct ways to call the addme function.
theOutput(17) = addme(2, 3)
theOutput(2) = addme(pi^2, sind(45))
See this documentation page for more information on defining functions.

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