.TH errbar 2 "April 1993" "Scilab Group" "Scilab Function" 
.so ../sci.an
.SH NAME 
errbar - add vertical error bars on a 2D plot
.SH CALLING SEQUENCE
.nf
errbar(x,y,em,ep)
.fi
.SH PARAMETERS
.TP 11
x,y,em,ep 
: four matrices of the same size.
.SH DESCRIPTION
\fVerrbar\fR adds vertical error bars on a 2D plot. 
\fVx\fR and \fVy\fR have the same meaning as in \fVplot2d\fR.
\fVem(i,j)\fR and \fVep(i,j)\fR stands for the error interval on the 
value \fVy(i,j)\fR: \fV[y(i,j)-em(i,j),y(i,j)+ep(i,j)]\fR.

Enter the command \fVerrbar()\fR to see a demo.
.SH EXAMPLE
.nf
t=[0:0.1:2*%pi]';
y=[sin(t) cos(t)]; x=[t t];
plot2d(x,y)
errbar(x,y,0.05*ones(x),0.03*ones(x))
.fi
.SH SEE ALSO
plot2d
.SH AUTHOR
J.Ph.C.