{"id":4247,"date":"2026-06-21T10:41:38","date_gmt":"2026-06-21T01:41:38","guid":{"rendered":"https:\/\/anagileway.com\/?p=4247"},"modified":"2026-06-21T10:41:38","modified_gmt":"2026-06-21T01:41:38","slug":"projection-problem","status":"publish","type":"post","link":"https:\/\/anagileway.com\/en\/2026\/06\/21\/projection-problem\/","title":{"rendered":"\u5c04\u5f71(\u5c0f\u554f\u984c)"},"content":{"rendered":"

\u554f\u984c\uff1a<\/h2>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n

\u3053\u306e\u554f\u984c\u306f\u3001$n$ \u6b21\u5143\u306e\u30d9\u30af\u30c8\u30eb\u30921\u6b21\u5143\uff08 $\\ba$ \u65b9\u5411\uff09\u3078\u3068\u5c04\u5f71\u3059\u308b\u554f\u984c\u3067\u3059\u3002\u3053\u3053\u304b\u3089\u59cb\u3081\u3066\u3001\u4e00\u822c\u306e\u76f4\u4ea4\u5c04\u5f71\u306e\u8868\u73fe\u884c\u5217\u3078\u3068\u9032\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u7b54\u3048\uff1a<\/h3>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n

<\/p>\n\n\n\n

$a$ \u65b9\u5411\u3078\u306e\u5c04\u5f71\u306f\u3001$a$ \u65b9\u5411\u306e\u5358\u4f4d\u30d9\u30af\u30c8\u30eb\u3068\u5185\u7a4d\u3092\u53d6\u3063\u3066\u3001\u305d\u306e\u65b9\u5411\u30d9\u30af\u30c8\u30eb\u65b9\u5411\u306b\u4f38\u3070\u3059\u3001\u3068\u3044\u3046\u64cd\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

$$
\\bq = \\ba \/ \\| \\ba \\| \\\\
\\hat {\\bb} = (\\bq \\cdot \\bb ) \\bq \\\\
$$<\/p>\n\n\n\n

\u3053\u308c\u306e\u639b\u3051\u7b97\u9806\u5e8f\u3092\u5909\u3048\u3066\u3001 $\\bb$ \u306e\u7dda\u5f62\u5909\u63db\u306e\u5f62\u306b\u6301\u3061\u8fbc\u3081\u308b\u3093\u3067\u3059\u3002<\/p>\n\n\n\n

$$
\\hat{ \\bb} = ( \\bp\\bp\\transp ) \\bb
$$
\u3088\u3063\u3066\u3001\u5909\u63db\u306e\u8868\u73fe\u884c\u5217\u306f\u3001<\/p>\n\n\n\n

$$
P = \\bp\\bp\\transp
$$<\/p>\n\n\n\n

\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u4e00\u822c\u7684\u306a\u90e8\u5206\u7a7a\u9593\u3078\u306e\u5c04\u5f71\u306b\u62e1\u5f35\u3057\u307e\u3059\uff08\u6b21\u306e\u8a18\u4e8b\uff09\u3002<\/p>","protected":false},"excerpt":{"rendered":"

\u554f\u984c\uff1a \u3053\u306e\u554f\u984c\u306f\u3001$n$ \u6b21\u5143\u306e\u30d9\u30af\u30c8\u30eb\u30921\u6b21\u5143\uff08 $\\ba$ \u65b9\u5411\uff09\u3078\u3068\u5c04\u5f71\u3059\u308b\u554f\u984c\u3067\u3059\u3002\u3053\u3053\u304b\u3089\u59cb\u3081\u3066\u3001 […]<\/p>\n","protected":false},"author":24727826,"featured_media":4194,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[782308494,782308495],"class_list":["post-4247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-linear-algebra","tag-vla"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p6Eiku-16v","jetpack-related-posts":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/anagileway.com\/wp-content\/uploads\/2026\/05\/EVD.png?fit=618%2C218&ssl=1","_links":{"self":[{"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/posts\/4247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/users\/24727826"}],"replies":[{"embeddable":true,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/comments?post=4247"}],"version-history":[{"count":5,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/posts\/4247\/revisions"}],"predecessor-version":[{"id":4257,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/posts\/4247\/revisions\/4257"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/media\/4194"}],"wp:attachment":[{"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/media?parent=4247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/categories?post=4247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/anagileway.com\/en\/wp-json\/wp\/v2\/tags?post=4247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}