Re: parse error when accessing meshgrid elements

[Tatsuro MATSUOKA]

----- Original Message -----

> From: rcharan51 
> To: help-octave
> Cc: 
> Date: 2014/6/24, Tue 19:32
> Subject: parse error when accessing meshgrid elements
> 
>t his is my code
> 
> x=chain(1,1): chain(55,1);
> y=-50:50;
> [xx,yy]=meshgrid(x,y);
> dia=str2num(input('enter the diameter of the shield \n', 
> 's'));
> vol=pi*.25*dia^2;
> percnt=str2num(input('enter the volume loss in percentage \n', 
> 's'));
> vloss=vol*percnt/100;
> k=str2num(input('enter the value of k \n', 's'));
> z=(vloss/(sqrt(2*pi)*k* getz(xx.))) * exp(-yy.^2/(2* (k*getz(xx.))^2));
> surf(x,y,z)
> 
> 
> this is the function getz()
> function [retval] = getz (input1)
> retval=0;
> global chain;
> for n=1:10;
>     j=11-n;
>     if input1>=chain(j, 1);
>       retval=chain(j, 7);
>       break;
>     endif
>   endfor
> endfunction
> 
> 
> 
> when i tried to compile the first code i am getting following error
> 
> parse error near line 38 of file
> C:\Octave\Octave-3.8.1\TUNNELING\tunnelallignment.m
> 
>   syntax error
> 
>>>>  zz=(vloss/(sqrt(2*pi)*k*getz(xx.))) * exp(-yy.^2/(2* (k*getz(xx.))^2));
>                                     ^
> please tell me what am i doing wrong


(vloss/(sqrt(2*pi)*k*getz(xx.))) is a matrix

exp(-yy.^2/(2* (k*getz(xx.))^2)) is a matrix


So the product should be element wise.

(vloss/(sqrt(2*pi)*k*getz(xx.))) . * exp(-yy.^2/(2* (k*getz(xx.))^2));


a dot (.) is missing before '*'.

However I did not test it so that the above is correct.