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Problem about rounding to 0
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I have a function w=u_1*u_2-u_3*u_4.
u_i's are also functions that return complex double numbers.
For some inputs i get the result w=0 (in workspace, not only in command window) which is a result that i dont like for my analysis (cause later i have to devide some numbers with it).
But when i compute the u_i's seperately and i do the operation u_1*u_2-u_3*u_4 (using the u_i results from workspace) i get a result like ''1.6941e-20 - 2.1684e-19i'' which is of course very small but different to 0.
Why dont i see this result for w instead of 0? How can i fix this ? Is it a rounding to 0 problem ?
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madhan ravi
le 30 Juil 2020
w = u_1 * u_2 - u_3 * sym(u_4)
Click on the tag floating-point.
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