openmodelica - Modelica: Mixing connectors and direct inputs -

-

the following modelica package - while neither being particularly useful nor interesting - not yield warnings.

package p   connector c     real c;   end c;   model     input c x;     output real y;   equation      y = x.c;   end a;   model b     input c inp;     output c out;     a;   equation      a.x = inp;     out.c = a.y;   end b; end p;

however, when a not use connectors in following case, there warning: the following input lacks binding equation: a.x. clearly, there binding equation a.x. why there such warning?

package p   connector c     real c;   end c;   model     input real x;     output real y;   equation      y = x;   end a;   model b     input c inp;     output c out;     a;   equation      a.x = inp.c;     out.c = a.y;   end b; end p;

the issue here there not binding equation. there ordinary equation. binding equation 1 applied modification element, e.g.

model b   input c inp;   output c out;   a(x=inp.c) "binding equation"; equation    out.c = a.y; end b;

note in general, if 2 things connectors, should not equated, should connected. avoid issue. in first version of b:

model b   input c inp;   output c out;   a; equation   connect(a.x, inp);    out.c = a.y; end b;

the reason binding equation restriction has making sure components balanced. can read more in specification or in modelica example. using binding equation, makes clear equation can used solve variable (i.e., term in equation containing variable won't vanish or ill-conditioned).


Comments

Post a Comment

Popular posts from this blog

c++ - No viable overloaded operator for references a map -

-
i trying use map can make tag names reference number. when try , use it, in code error (6 in total every time reference map): src/main.cpp:25:45: error: no viable overloaded operator[] type 'std::map<std::string, std::string>' const char* idcs = node.child_value(tagmap[3]); this code: #include "pugi/pugixml.hpp" #include <iostream> #include <string> #include <map> int main() { pugi::xml_document doca, docb; std::map<std::string, pugi::xml_node> mapa, mapb; std::map<std::string, std::string> tagmap {{"1", "data"}, {"2", "entry"}, {"3", "id"}, {"4", "content"}}; if (!doca.load_file("a.xml") || !docb.load_file("b.xml")) { std::cout << "can't find input files"; return 1; } (auto& node: doca.child(tagmap[1]).children(tagmap[2])) { co
Read more

java - Custom OutputStreamAppender not run: LOGBACK: No context given for <MYAPPENDER> -

-
i wish write custom appender on basis of outputstreamappender . wrote following class package tests; import java.io.ioexception; import java.io.outputstream; import ch.qos.logback.core.outputstreamappender; public class myappender<e> extends outputstreamappender<e> { public myappender() { system.out.println("myappender created"); setoutputstream(new outputstream() { @override public void write(int b) throws ioexception { throw new unsupportedoperationexception(); } }); } } then wrote following runner: package tests; import org.slf4j.loggerfactory; import ch.qos.logback.classic.logger; public class runner { private static final logger log = (logger) loggerfactory.getlogger(runner.class); public static void main(string[] args) { //log.addappender(new myappender<iloggingevent>()); log.info("hello world"); } } finall
Read more

java - Cannot secure connection using TLS -

-
i'm trying establish secure socket connection between java client applet (built jdk 1.7.0_75-b13) , vc++ server application. as test vehicle, used vc++ client/server sample found in msdn forums, modified use schannel , able establish socket using cipher suite tls_rsa_with_aes_128_cbc_sha. works of tls 1.0/1.1/1.2. when try opening socket java applet same server application, connection rejected server reporting following: tls 1.0 acceptsecuritycontext failed: 0x80090327 tls 1.1 acceptsecuritycontext failed: 0x80090331 tls 1.2 acceptsecuritycontext failed: 0x80090331 this java code used create socket: debugprint("setting secure connection"); sslsocketfactory sslsocketfactory = (sslsocketfactory) sslsocketfactory.getdefault(); sslsocket sslsocket = (sslsocket) sslsocketfactory.createsocket("127.0.0.1", socketnumber); debugprint("starting handshake"); sslsocket.settcpnodelay(true); sslsocket.setsolinger(false, 0); sslsocket.s
Read more