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1,126 bytes added ,  13:07, 22 April 2017
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ans =
 
ans =
 
   -0.82502  4.20248  -1.57080
 
   -0.82502  4.20248  -1.57080
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</source>
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<source lang="octave">
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##Demo of how to graph symbolic functions (by converting SYMBOLIC functions into ANONYMOUS functions)
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##The following code will produce the same vector field plot as Figure 1.14 from Example 1.6 (pg. 39) from A Student's Guide to Maxwell's Equations by Dr. Daniel Fleisch.
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##Make sure symbolic package is loaded and symbolic variables declared.
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pkg load symbolic;
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syms x y
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##Write a Vector Field Equation in terms of symbolic variables
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vector = [sin(pi .* y ./2 ); -sin(pi .* x ./2 )];
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##Vector components are converted from symoblic into anonymous form which allows them to be graphed
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##The '1' & '2', in vector(1) & vector(2) are indeces for the vector.
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##The " 'vars', [x y]" syntax tells function_handle that each component is a function of both 'x' & 'y'
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iComponent = function_handle (vector(1), 'vars', [x y]);
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jComponent = function_handle (vector(2), 'vars', [x y]);
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##Setting the Grid up to graph all axes for all variables from -.5 to .5, with spacings .05 apart.
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[X,Y] = meshgrid([-.5:.05:.5]);
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##Draw the Vector Field!
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figure
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quiver(X,Y,iComponent(X,Y),jComponent(X,Y))
    
</source>
 
</source>
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