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# showing error - Invalid expression. When calling a function or indexing a variable, use parentheses

## showing error - Invalid expression. When calling a function or indexing a variable, use parentheses

(OP)
Main file starts from %1: showing error - Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

% 1. Remodelling procedure
for i = 1:N_ele
if (emat(i,a)<101)
% CALCULATION OF DELTA RHO AND DELTA MAT
% u strain energy density
% rho density
% k reference stimulus for proximal femur
% B remodeling ratio coefficient
% s lazy zone parameter
[d_rho(i,a), d_mat(i,a)] = dr(sed(i,a), emat(i,a)*0.02, 0.004, B(....), 0.35, 1);
% MATERIAL UPDATE
emat(i,a+1) = emat(i,a) + d_mat(i,a);
% MATERIAL CONTROL
if (emat(i,a+1)>100)
emat(i,a+1) = 100;
elseif (emat(i,a+1)<4)
emat(i,a+1) = 4;
end
else
emat(i,a+1) = emat(i,a);
end
end

function file is called in line ([d_rho(i,a), d_mat(i,a)] = dr(sed(i,a), emat(i,a)0.02, 0.004, B(....), 0.35, 1);) which is described below

% u strain energy density [MPa]
% rho density in [g/cm3]
% k reference stimulus
% B remodeling coefficiant
% s range of lazy zone
d_rho = 0;
stimu = u/rho; % Stimulus

if stimu > k*(1+s)
d_mat = 1;
d_rho = 0.02;
elseif stimu < k*(1-s)
d_mat = -1;
d_roh = -0.02;
else
d_roh = 0;
d_mat = 0;
end

if stimu > k*(1+s)
d_rho = B*(u/rho-k*(1+s));
d_mat = round(d_rho/0.02);
if d_mat > 4
d_mat = 4;
end
elseif stimu < k*(1-s)
d_rho = B*(u/rho-k*(1-s));
d_mat = floor(d_rho/0.02);
if d_mat < -6
d_mat = -6;
end
else
d_rho = 0;
d_mat = 0;
end
else
stop;
end

### RE: showing error - Invalid expression. When calling a function or indexing a variable, use parentheses

B(....) is a syntax that is new to me. Not to say it is wrong, but it looks wrong. There are other errors. i'm not inclined to spend any time on a piece of code with undefined variables

Cheers

Greg Locock

New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

### RE: showing error - Invalid expression. When calling a function or indexing a variable, use parentheses

Also, use the code icon, and you won't lose your indenting. this will help you find another problem.

Cheers

Greg Locock

New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

### RE: showing error - Invalid expression. When calling a function or indexing a variable, use parentheses

I think you misspelled d_rho as d_roh twice
you have some extra ends floating around

=====================================
(2B)+(2B)' ?

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