MATLAB: How to skip an error inside a loop so the loop continues

errorMATLAB

The following is my full code: (The part of the code that is causing me trouble is towards the end)
   clc;
          clear;
          P = xlsread('b3.xlsx', 'P');
          d = xlsread('b3.xlsx', 'd');
          CM = xlsread('b3.xlsx', 'Cov');
          Original_PD = P;                       %Store original PD
          LM_rows = size(P,1)+1;                           %Expected LM rows
          LM_columns = size(P,2);                 %Expected LM columns
          LM_FINAL = zeros(LM_rows,LM_columns);    %Dimensions of LM_FINAL
          % Start of the outside loop
          for k = 1:size(P,2)
          P = Original_PD(:,k);
          interval = cell(size(P,1)+2,1);
          for i = 1:size(P,1)
              interval{i,1} = NaN(size(P,1),2);
              interval{i,1}(:,1) = -Inf;
              interval{i,1}(:,2) = d;
              interval{i,1}(i,1) = d(i,1);
              interval{i,1}(i,2) = Inf;
          end
          interval{i+1,1} = [-Inf*ones(size(P,1),1) d];
          interval{i+2,1} = [d Inf*ones(size(P,1),1)];
          c = NaN(size(interval,1),1);
          for i = 1:size(c,1)
              c(i,1) = mvncdf(interval{i,1}(:,1),interval{i,1}(:,2),0,CM);
          end
          c0 = c(size(P,1)+1,1);
          f = c(size(P,1)+2,1);
          c = c(1:size(P,1),:);
          b0 = exp(1);
          b = exp(1)*P;
          syms x;
          eqn = f*x;
          for i = 1:size(P,1)
              eqn = eqn*(c0/c(i,1)*x + (b(i,1)-b0)/c(i,1));
          end
          eqn = c0*x^(size(P,1)+1) + eqn - b0*x^size(P,1);
          x0 = solve(eqn);
          for i = 1:size(x0)
              id(i,1) = isreal(x0(i,1));
          end
          x0 = x0(id,:);
          x0 = x0(x0 > 0,:);
          clear x;
          for i = 1:size(P,1)
              x(i,:) = (b(i,1) - b0)./(c(i,1)*x0) + c0/c(i,1);
          end
          x = [x0'; x];
          x = double(x);
          x = x(:,sum(x <= 0,1) == 0)
          lamda = -log(x);
          LM_FINAL(:,k) = lamda;
          end
      % end of the outside loop
The important part of the above loop is towards the end:
x = x(:,sum(x <= 0,1) == 0)
This condition is sometimes not satisfied and hence the variable x is empty, which means LM_FINAL(:,k) = lamda is also empty. When this happens, I get the error:
    x =
         Empty matrix: 43-by-0
          Improper assignment with rectangular empty matrix.
          Error in Solution (line 75)
          LM_FINAL(:,k) = lamda;
How can I skip this error so that the column for LM_FINAL remains as empty, but the loop continues (so that the rest of LM_FINAL's columns are filled) rather than terminating?

Best Answer

You could wrap the code inside the line
if not(isempty(x))
  ...
end
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