diff() function
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11-09-2014, 02:29 PM
Post: #1
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diff() function
A diff() problem:
Example: f(x,y):+x²-2*x*y+3*y²+2*x-2*y 1.) diff(f(x,y),x) ---> 2.*x-2.*y+2. 2.) diff(f(x,y),y) ---> -2*x+6*y-2 x - direction: 3.) diff(diff(f(x,y),x)) ---> 2 4.) diff( 2.*x-2.*y+2,x) ---> 2 5.) diff(f(x,y),x$2) ---> 2 y - direction: 6.) diff(diff(f(x,y),y)) ---> -2 7.) diff(-2*x+6*y-2,y) ---> 6 8.) diff(f(x,y),y$2) ---> 6 The second derivative in the x-direction worked properly. The second derivative in the y-direction worked improperly in the red highlighted case(??) (The template key entry method worked properly for these examples.) |
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diff() function - DrD - 11-09-2014 02:29 PM
RE: diff() function - Han - 11-09-2014, 02:51 PM
RE: diff() function - DrD - 11-09-2014, 05:53 PM
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