How to solve spmd problem

Hi guys

i am programming kuka robot. I would like to obtain datas with arduino. That is why I am usuing paralel functions.However, I have problem and I do not know whether it is about spmd or not.

The error ='"i" previously appeared to be used as a function or command, conflicting with its use here as the name of a variable.

A possible cause of this error is that you forgot to initialize the variable, or you have initialized it implicitly using load or eval.'

I did not use i as a function but I load variable.mat to call i. Following I add my codes...

%%%Main program

function data = main
PointList.PointID = [1,2,3,4,5];
PointList.X = [1000,1100,1200,1250,1300];
PointList.Y = [0,0,0,0,0];
PointList.Z = [1400,1450,1455,1470,1500];
PointList.A = [-159.84,-159.84,-159.84,159.84,159.84];
PointList.B = [89.93,89.93,90,98,98];
PointList.C = [-160.05,160.05,160.05,160.05,160.05];
funList = {@fun1,@fun2};
dataList = {PointList,PointList}; % or pass file names 

matlabpool ('local',2)

spmd
    labBarrier
    Daten1 = funList{labindex}(dataList{labindex});
end

data = {Daten1{:}};

and now fun 1

function [PointID] = fun1(PointList)
....
load variablen_1
...
if posreached (RIst, RSol, i) == 1
        Counter = IPOC(i);        

          while IPOC(i) < Counter+2000

              Ein=H.Ein(2);
              Aus=H.Aus(1);

              reply = ['<Sen Type="ImFree"><EStr>' Msg '</EStr>'...
                  '<Tech T21="0.0" T22="0.0" T23="0.0" T24="0.0" T25="0.0" T26="0.0" T27="0.0" T28="0.0" T29="0.0" T210="0.0" />'...
                  '<Pos X="' num2str(X) '" Y="' num2str(Y) '" Z="' num2str(Z) '"'...
                  'A="' num2str(A) '" B="' num2str(B) '" C="' num2str(C) '"/>'...
                  '<Speed>' num2str(speed) '</Speed><Waittime>' num2str(waittime) '</Waittime>'...
                  '<Mode>' num2str(mode) '</Mode><Point_ID>' num2str(hPoint) '</Point_ID>'...
                  '<Spindel Ein="' num2str(Ein) '" Aus="' num2str(Aus) '"/>'...
                  '<Drehzahl>' num2str(Drehzahl) '</Drehzahl>'...
                  '<IPOC>' num2str(RIst.IPOC(end)) '</IPOC></Sen>' ];

              fwrite(con,double(reply));     %Schickt Antwort an Roboter zurück

              i=i+1;  

    end

i cut some codes. As you see I used i as an input in another function too. I did not get any errors on these lines just on i=i+1

Do you have any idea?

Thanxx

Answer 1

[Walter Roberson]

By default i and j are functions that return sqrt(-1) . But inside fun1 you have i=i+1 indicating that you think i is a variable instead of a function. Where did that variable come from?

If your answer is that you are loading i from the .mat file and having it magically appear in the workspace, then "Don't do that!" . Instead, use

datastruct = load('variablen_1');
i = datastruct.i;

... and keep in mind that it is always going to be the same value of i that is loaded since you are not writing to variablen_1.mat in your code. Your code would be clearer and more efficient if you were to do the load() once in main and pass i as a parameter to fun1