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

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
       % dr      (u,rho,k,B,s,adapt) 
       % u        strain   energy   density
       % rho      density
       % k        reference   stimulus    for proximal    femur
       % B        remodeling   ratio   coefficient 
       % s        lazy zone parameter
       % adapt   =   0  --> step adaptation
       % adapt   =   1  --> linear adaptation
       [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

    % A.    Step adaptation
    Function [d_rho,d_mat] = dr(u,rho,k,B,s,adapt)
    d_rho = 0;
    stimu = u/rho;    %    Stimulus
    % Adaptation    functions
    if (adapt == 0)    
    % step   adaptation
    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
    %  B. Linear adaptation. 
    elseif (adapt == 1)  
    % linear adaptation
    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
    sprintf('Wrong adaptation!')
    stop;
    end

Answer 1

[Walter Roberson]

       [d_rho(i,a), d_mat(i,a)] = dr(sed(i,a), emat(i,a)*0.02, 0.004, B(....), 0.35, 1); 
                                                                        ^^^^

The ... is considered a continuation indicator . Everything after it on the line is treated as a comment, and the next line is brought up and treated as if it were on the end of this line. The next line in your code is a comment -- but that comment does not close the ) started by the ( after the B

[Nitesh Kumar Singh]

Thank u sir