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Divendo / math-dragon

An Android app that features an intuitive drag&drop interface for solving mathematical problems
GNU Lesser General Public License v3.0
15 stars 10 forks source link

Deriviatives fail on compound variables #158

Closed TimdeJonge closed 10 years ago

TimdeJonge commented 10 years ago

d6x^2/d6x is evaluated to 0, whereas it is 2x^2. Similarly, d((xy)^2)/d(xy) is evaluated to 0. Proposed fix: only allow derivatives to have simple variables.

FolkertVanVerseveld commented 10 years ago

Proposed fix: only allow derivatives to have simple variables.

This fix has already been proposed. It seems that this bug is still there.

TimdeJonge commented 10 years ago

I couldn't find it in the open issues, only for Limit, which meant that it was either wrongly closed, or it broke again since - either way, as it has not been implemented, it seems like a reasonable proposition, even if it is a repeat. On Jan 26, 2014 8:12 PM, "FolkertVanVerseveld" notifications@github.com wrote:

Proposed fix: only allow derivatives to have simple variables.

This fix has already been proposed. It seems that this bug is still there.

— Reply to this email directly or view it on GitHubhttps://github.com/Divendo/math-dragon/issues/158#issuecomment-33326817 .