{"id":12964,"date":"2017-09-27T20:16:02","date_gmt":"2017-09-28T03:16:02","guid":{"rendered":"https:\/\/www.podfeet.com\/blog\/?p=12964"},"modified":"2017-09-28T07:10:51","modified_gmt":"2017-09-28T14:10:51","slug":"dumb-equation-error","status":"publish","type":"post","link":"https:\/\/www.podfeet.com\/blog\/2017\/09\/dumb-equation-error\/","title":{"rendered":"When an Engineer Makes a Dumb Equation Error"},"content":{"rendered":"

\"Area<\/a>Remember last week when we played Which Screen is Bigger, iPhone 8 Plus or X? AKA Fun with Geometry<\/a>? I went through, in rather excruciating detail, how to calculate the size of the screen on the iPhone X vs the iPhone 8 Plus.<\/p>\n

I wrote it up as a blog post, and Steve (also an engineer) checked all of my math before I posted it. The blog post was up for two days, when many of you read it.But then on Sunday I read it out loud as part of the NosillaCast. And on Monday, Quazim and Jill both wrote to me telling me of an idiotic error on my part. Remember when I calculated the area of the circles, subtracted them from squares and such to take into account the roundy corners of the iPhone X?<\/p>\n

I said that the area of a circe is \u03c0D. As Quazim so eloquently posted on the blog, “My maths is rusty\u2026 but I thought the area of a circle is pii * radius (squared) and not pii * diameter, which is what you used here.”<\/p>\n

Can you believe I did that? Can you believe Steve missed it in his careful checking? Can you believe none of you who read the blog post caught it either? One of the reasons I do the blog posts is that so you guys can catch dumb things I say before<\/em> it’s in the podcast!<\/p>\n

Yes, I’m throwing everyone under the bus with me on this one!<\/p>\n

I was so appalled at myself that I punished myself. I went back to my drawing and made the line thicknesses much thinner so I could zoom in super tight and get the circles exactly spot on the vector drawing from Apple. <\/p>\n

That’s when I discovered another mistake in Victor H’s explanation on iphonearena.com<\/a>. He used a drawing from someone else to do his calculations. However, the radius shown for the big round corners is way off. It doesn’t matter for Victor’s calculations though because I’m still convinced he used wildly wrong pixel dimensions for the iPhone 8 Plus screen so he’s way off anyway.<\/p>\n

Now here’s the funny thing. My calculations didn’t change all that much when I used the correct equations for the circular areas. I’ve redone the blog post (admitting there that I messed up too), and the iPhone 8 Plus still has a bigger screen area in square inches than the iPhone X, but it’s much closer than it was. The iPhone 8 Plus is less than 1% bigger than the iPhone X.<\/p>\n

I’m embarrassed beyond belief (that’s why it took me two days to admit it to you) and I sure hope there’s no more mistakes in here! If there are, please tell me before Sunday???<\/p>\n","protected":false},"excerpt":{"rendered":"

Remember last week when we played Which Screen is Bigger, iPhone 8 Plus or X? AKA Fun with Geometry? I went through, in rather excruciating detail, how to calculate the size of the screen on the iPhone X vs the iPhone 8 Plus. I wrote it up as a blog post, and Steve (also an […]<\/p>\n","protected":false},"author":1,"featured_media":12904,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[147],"tags":[1880,1886],"class_list":["post-12964","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-posts","tag-geometry","tag-mistake"],"jetpack_featured_media_url":"https:\/\/www.podfeet.com\/blog\/wp-content\/uploads\/2017\/09\/corner_geometry.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/posts\/12964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/comments?post=12964"}],"version-history":[{"count":7,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/posts\/12964\/revisions"}],"predecessor-version":[{"id":12971,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/posts\/12964\/revisions\/12971"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/media\/12904"}],"wp:attachment":[{"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/media?parent=12964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/categories?post=12964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.podfeet.com\/blog\/wp-json\/wp\/v2\/tags?post=12964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}