# Dimension 1 is fixed on the left-hand side but varies on the right ([1 x 1] ~= [:? x 1]).

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Federico Avino am 26 Jan. 2021
Good morning,
I'm writing a piece of code in a simulink block. Here the code
function [otv1, otv2, otv3] = TCU(P_tank1, P_tank2, P_tank3, time)
%% input
toll = 1; %[bar]
% coder.varsize('otv1');
% coder.varsize('otv2');
% coder.varsize('otv3');
persistent OTV1 OTV2 OTV3
if isempty(OTV1); OTV1 = 0; end
if isempty(OTV2); OTV2 = 0; end
if isempty(OTV3); OTV3 = 0; end
if time <= 0
OTV1 = 0;
OTV2 = 0;
OTV3 = 0;
else
Tank_unsorted =[P_tank1 OTV1
P_tank2 OTV2
P_tank3 OTV3];
% ordine decrescente di pressione
[Tank, index] = sortrows(Tank_unsorted, 'descend');
if (Tank(1,1) - Tank(2,1)) >= toll
Tank(1,2) = 1;
Tank(2,2) = 0;
Tank(3,2) = 0;
else if (Tank(1,1) - Tank(2,1)) < toll
Tank(1,2) = 1;
Tank(2,2) = 1;
Tank(3,2) = 0;
else if (Tank(2,1) - Tank(3,1)) <= toll
Tank(1,2) = 1;
Tank(2,2) = 1;
Tank(3,2) = 1;
end
end
end
end
index_otv = find(index == 1);
OTV1 = Tank(index_otv, 2);
index_otv = find(index == 2);
OTV2 = Tank(index_otv, 2);
index_otv = find(index == 3);
OTV3 = Tank(index_otv, 2);
%% output
otv1 = OTV1;
otv2 = OTV2;
otv3 = OTV3;
I tried the logic of the code in a script, and it works: OTVn in the end contains the correct scalar. But during the execution i have the error I wrote in the title at the lines
OTV1 = Tank(index_otv, 2);
and similar. But actually OTVn contains a scalar, because it's extracted from the matrix Tank.
I have tried the solutions on the net, but none of them worked (including coder.varsize). How could i overcome the problem? Considering the goal is to generate code
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