*Note : for once, this is a cross-post from ask.sagemath.org <https://ask.sagemath.org/question/52922/latexing-showing-or-viewing-a-held-integral-triggers-its-evaluation/>, for ticket advice…*
Exploring this ask.sagemath question <https://ask.sagemath.org/question/52913/error-during-integration-not-of-type-unsigned-byte-15/> led me to discover what I think is a serious bug : it seems that latexing an expression *containing* a held (= unevaluated) integral triggers the latter’s evaluation ; ditto for viewing or showing… Minimal case: sage: Ig=sin(x) sage: It=Ig.integrate(x,-pi,pi,hold=True) sage: Cs=1/(2*pi) sage: latex(It) \int_{-\pi}^{\pi} \sin\left(x\right)\,{d x} So far, so good. But : sage: Ex=Cs*It sage: Ex 1/2*integrate(sin(x), x, -pi, pi)/pi sage: latex(Ex) \frac{0}{2 \, \pi} Aaaarghh ! And, of course : sage: show(Ex) \newcommand{\Bold}[1]{\mathbf{#1}}\frac{0}{2 \, \pi} And view(Ex) proudly displays this crap… IMHO, this is a serious bug, entailing a risk of inadvertently triggering long, impossible or never ending computations. Unless someone points me to the direction and magnitude of my stupidity, I intend to file this as a *critical* (maybe *blocker*) ticket; however, the target is not clear to me : I do not thoink that the rendering system is the only culprit (nor even the main one…) ; there may be a more fundamental problem in the evaluation system. Advice ? -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/8c68f8e1-7bf7-4f6f-9c50-9adb9a905911o%40googlegroups.com.
