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 ?
1 个评论
James Tursa
2020-7-30
Please provide an example set of inputs and desired output.
回答（1 个）
madhan ravi
2020-7-30
w = u_1 * u_2 - u_3 * sym(u_4)
Click on the tag floating-point.
2 个评论
Dimitris Sarvanis
2020-7-30
madhan ravi
2020-7-30
Set tolerance.
w(real(w) < 1e-2 & imag(w) < 1e-2) = 0
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2020-7-30
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2021-8-20
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