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Error in simulink, the upper bound is not specified

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Hello everyone,
I am trying to build a matrix with a matlab function in Simulink. However, I always get some error message and already tried to fix it with:
coder.varsize('y1', [1,L], [0 1]);
The error message is the following:
This is the matlab function
function [y1, y2, y3, L] = fcn(u, x, acc_y, acc_z,L,k)
coder.varsize('y1', [1,L], [0 1]);
coder.varsize('y2', [1,L], [0 1]);
coder.varsize('y3', [1,L], [0 1]);
if u == 0
y1 = zeros(L,1);
y2 = zeros(L,1);
y3 = zeros(L,1);
elseif u < 1
r = randi([1 k(1)-L],1,1);
y1 = x(1,r:r+L);
y2 = acc_y(r:r+L,1);
y3 = acc_z(r:r+L,1);
elseif u < 5
r = randi([1 k(2)-L],1,1);
y1 = x(r:r+L,2);
y2 = acc_y(r:r+L,2);
y3 = acc_z(r:r+L,2);
elseif u < 10
r = randi([1 k(3)-L],1,1);
y1 = x(r:r+L,3);
y2 = acc_y(r:r+L,3);
y3 = acc_z(r:r+L,3);
elseif u < 15
r = randi([1 k(4)-L],1,1);
y1 = x(r:r+L,4);
y2 = acc_y(r:r+L,4);
y3 = acc_z(r:r+L,4);
elseif u < 20
r = randi([1 k(5)-L],1,1);
y1 = x(r:r+L,5);
y2 = acc_y(r:r+L,5);
y3 = acc_z(r:r+L,5);
elseif u < 25
r = randi([1 k(6)-L],1,1);
y1 = x(r:r+L,6);
y2 = acc_y(r:r+L,6);
y3 = acc_z(r:r+L,6);
elseif u < 30
r = randi([1 k(7)-L],1,1);
y1 = x(r:r+L,7);
y2 = acc_y(r:r+L,7);
y3 = acc_z(r:r+L,7);
elseif u < 35
r = randi([1 k(8)-L],1,1);
y1 = x(r:r+L,8);
y2 = acc_y(r:r+L,8);
y3 = acc_z(r:r+L,8);
elseif u < 40
r = randi([1 k(9)-L],1,1);
y1 = x(r:r+L,9);
y2 = acc_y(r:r+L,9);
y3 = acc_z(r:r+L,9);
elseif u < 45
r = randi([1 k(10)-L],1,1);
y1 = x(10,r:r+L);
y2 = acc_y(r:r+L,10);
y3 = acc_z(r:r+L,10);
elseif u < 50
r = randi([1 k(11)-L],1,1);
y1 = x(r:r+L,11);
y2 = acc_y(r:r+L,11);
y3 = acc_z(r:r+L,11);
elseif u < 55
r = randi([1 k(12)-L],1,1);
y1 = x(r:r+L,12);
y2 = acc_y(r:r+L,12);
y3 = acc_z(r:r+L,12);
elseif u < 60
r = randi([1 k(13)-L],1,1);
y1 = x(13,r:r+L);
y2 = acc_y(r:r+L,13);
y3 = acc_z(r:r+L,13);
elseif u < 65
r = randi([1 k(14)-L],1,1);
y1 = x(r:r+L,14);
y2 = acc_y(r:r+L,14);
y3 = acc_z(r:r+L,14);
elseif u < 70
r = randi([1 k(15)-L],1,1);
y1 = x(r:r+L,15);
y2 = acc_y(r:r+L,15);
y3 = acc_z(r:r+L,15);
elseif u < 75
r = randi([1 k(16)-L],1,1);
y1 = x(r:r+L,16);
y2 = acc_y(r:r+L,16);
y3 = acc_z(r:r+L,16);
else
r = randi([1 k(17)-L],1,1);
y1 = x(r:r+L,17);
y2 = acc_y(r:r+L,17);
y3 = acc_z(r:r+L,17);
end
L = L;
The setting of y1 is the following:

Answers (1)

Chaitanya Mallela
Chaitanya Mallela on 24 Dec 2020
you must specify a numerical upperbound in the size column in Ports and Data Manager to make Simulink realize a variable sized array. In this case you may declare size as [1,L].
Refer the documentation that demonstrates variable size declarations

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