\(\(\( (*\ \ Laboratory\ Exercise\ #5 : \ 
        Graphing\ 2 - 
          dimensional\ vector\ fields
MATH\ 261\ 
Ron\ Umble, \ 
      Instr . 
\ \ 
\ 
          Your\ \(Name : 
\ \(Date : \ 

\ \ \ \ This\ exercise\ graphs\ representative\ vectors\ in\ 2 - 
              dimensional
\ 
                vector\ fields . \ 

\(Assignment : \ 

\ 
                    A\ picture\ of\ the\ vector\ field\ for\ problem\ 5\ on\ p . \ 1106\ is\ displayed
below . \ \ Change\ the\ component\ functions\ f1\ and\ f2\)\)\), \ 
      then\ display\ and\ 
\ \ \ \ \ \ print\ out\ pictures\ of\ the\ vector\ fields\ defined\ in\ problems\ 7 - 
        10, \ 
\ \ \ \ \ \ \ \ and\ 17 - 
        22\ on\ pp . \ 1106 - 
        1107. \ \ 

*) \)\(
\)\)\)

<< Graphics`PlotField`

f1[x_, y_] := -y

f2[x_, y_] := x

PlotVectorField[{f1[x, y], f2[x, y]}, {x, -1, 1}, {y, -1, 1}, 
      Axes -> True]