MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Guide de l'utilisateur télécharger pdf (Page 85)

Quick Start Tutorials

3-29

Comparing Numerical Results of the Simulation

and the Generated Program

Your Simulink simulations and the generated code should produce nearly

identical output.

You have now obtained data from a Simulink run of the model, and from a

run of the program generated from the model. It is a simple matter to

compare the

f14rtw model output to the results achieved by Real-Time

Workshop.

Comparing

Angle_of_attack (simulation output) to rt_Angle_of_attack

(generated program output) produces

max(abs(rt_Angle_of_attack-Angle_of_attack))

ans =

1.0e-015 *

0 0.3331

Comparing Pilot_G_force (simulation output) to rt_Pilot_G_force

(generated program output) produces

max(abs(rt_Pilot_G_force-Pilot_G_force))

1.0e-013 *

0 0.6395

Overall agreement is within 10

-13

. The means of residuals are an order of

magnitude smaller. This slight error can be caused by many factors, including

• Different compiler optimizations

• Statement ordering

• Run-time libraries

For example, a function call such as

sin(2.0) might return a slightly

different value, depending on which C library you are using.

For the same reasons, your comparison results might not be identical to those

above.

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 129 130

Pas de commentaire

MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Guide de l'utilisateur Page 85