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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by tinkusch[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8G SR6 (v8.0988) Operating System: XP Hi folks, I try to read the max value from an origin matrix into an origin variable. The following c function works so far void EX1(string MNAME) { double dMax; Matrix matA; matA.Attach(MNAME); dMax = matA.GetMax(); printf("Max of Matrix1: %g\n", dMax); } but does not solve the problem completely. MNAME is an existing Origin matrix containing doubles. The version below using return does not work: double EX2(string MNAME) { double dMax; Matrix matA; matA.Attach(MNAME); dMax = matA.GetMax(); return dMax; } I always get the error message "Unattached wrapper class..." when I call this function in the ORIGIN script window or a LabTalk script, as: EX2(MNAME)=; or VAL = EX2(MNAME); Can somebody please help me finding the solution. By the way, the following function compiled and worked perfectly in PRO 7.5, but does not in Pro 8 SR6: float MatMax(string MNAME) { double dMax; Matrix mat(MNAME); dMin = mat.GetMin(); return dMax; } Seems, there was a slight change in the declaration syntax from (Pro 7.5): Matrix mat(MNAME); to (Pro 8): Matrix matA; matA.Attach(MNAME); Any help and comments welcome, thanks Stefan [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.