At the beginning of 2020 Matlab(Simulink) has stop the block called Fcn. I need a block in Simlink that is the same in 2021a.Please help.

Question

Stephen Bell 2021-8-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/897347-at-the-beginning-of-2020-matlab-simulink-has-stop-the-block-called-fcn-i-need-a-block-in-simlink-t

回答： Bhuvanyu Dogra 2021-8-16

clear all
close all
clc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
%the equation put in Fcn (block)is (-m*g-sgn(u[1]*A*rho*u[1]^2)/m  in simulink 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%The rest of the code I can work out myself. I need a substitution for Fcn block please. 
g=9.81
d=0.1;
rhoMaterial =100;
R=.287 % gas constant for air kj/kg;
p=101.325 % barometric pressure
t=20; % temperture 
rhoAir =p/(R*(273+t));% 
A=pi*d.^2/4;
m=rhoMaterial*1/6*pi*d.^3
Cd=0.6;%0.6;
theta=40' %54 %boomerang
v=40;
xdot0 =v*cos(theta*pi/180);
ydot0=v*cos(theta*pi/180);
x0=0;
y0=0;
wx=-10; %-10
wy=0;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% call the Simulink model. Results(states)returned to Workspace in xout
sim('traject');
%plot(xout(:,1),xout(:2))
quiver(xout(:,1),xout(:,2),xout(:,3),xout(:,4))
axis equal
hold on
plot(xout(end,1),xout(end,2),'ro')
xlabel('x [m]')
ylabel('y [m]')
title(sprintf('v=%.2fm/s, \\theta=%.1f^o',v,theta))
grid on