{"id":24250,"date":"2021-10-14T09:18:47","date_gmt":"2021-10-14T03:48:47","guid":{"rendered":"https:\/\/python-programs.com\/?p=24250"},"modified":"2021-11-05T21:02:29","modified_gmt":"2021-11-05T15:32:29","slug":"python-program-for-log-function","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-program-for-log-function\/","title":{"rendered":"Python Program for log() Function"},"content":{"rendered":"<p>In the previous article, we have discussed <a href=\"https:\/\/python-programs.com\/python-program-for-expm1-function\/\">Python Program for expm1() Function<\/a><br \/>\n<strong>log() Function in Python:<\/strong><\/p>\n<p>The math.log() method returns the natural logarithm of a number or the base logarithm of a number.<\/p>\n<p><strong>Syntax:<\/strong><\/p>\n<pre>math.log(x,\u00a0base)<\/pre>\n<p><strong>Parameters:<\/strong><\/p>\n<p><strong>x: <\/strong>This is required. It is a number. It Specifies the value for which the logarithm should be calculated. If the value is 0 or a negative number, a ValueError is returned. If the value is not a number, a TypeError is returned.<\/p>\n<p><strong>base:<\/strong> This is optional. The logarithmic base that should be used. &#8216;e&#8217; is the default.<\/p>\n<p><strong>Return Value:<\/strong><\/p>\n<p>Returns a float value corresponding to the natural logarithm of a number or the logarithm of a number to base.<\/p>\n<ul>\n<li>The log function returns the output if the number argument is positive.<\/li>\n<li>If the number is negative or zero, the log function throws a ValueError.<\/li>\n<li>If it is not a number, the log function throws a TypeError.<\/li>\n<\/ul>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Example1:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given first number = 1\r\nGiven second number = 6<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The result after applying log() function on above given first number 1  =  0.0\r\nThe result after applying log() function on above given second number 6  =  1.791759469228055<\/pre>\n<p><strong>Example2:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given first number = 7\r\nGiven second number = 9<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The result after applying log() function on above given first number 7  =  1.9459101490553132\r\nThe result after applying log() function on above given second number 9  =  2.1972245773362196<\/pre>\n<h2>Program for log() Function in Python<\/h2>\n<ul>\n<li><a href=\"#Using_Built-in_Functions_(Static_Input)\">Using Built-in Functions (Static Input)<\/a><\/li>\n<li><a href=\"#Using_Built-in_Functions_(User_Input)\">Using Built-in Functions (User Input)<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_Built-in_Functions_(Static_Input)\">Method #1: Using Built-in Functions (Static Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import math module using the import keyword.<\/li>\n<li>Give the list as static input and store it in a variable.<\/li>\n<li>Give the first number as static input and store it in another variable.<\/li>\n<li>Apply math.log() function to the given first number to get the natural logarithm or the base logarithm of a given number.<\/li>\n<li>Store it in another variable.<\/li>\n<li>Print the above result.<\/li>\n<li>Similarly, do the same for the other number.<\/li>\n<li>Apply the math.log() function to the given list element and print it.<\/li>\n<li>The Exit of Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Import math module using the import keyword.\r\nimport math\r\n# Give the list as static input and store it in a variable.\r\ngvn_lst = [10, 5, 20, 25, 12]\r\n# Give the first number as static input and store it in another variable.\r\ngvn_numb1 = 1\r\n# Apply math.log() function to the given first number to get the natural logarithm\r\n# or the base logarithm of a given number.\r\n# Store it in another variable.\r\nfnl_rslt = math.log(gvn_numb1)\r\nprint(\"The result after applying log() function on above given first number\",\r\n      gvn_numb1, \" = \", fnl_rslt)\r\n# similarly do the same for the other number.\r\ngvn_numb2 = 6\r\nprint(\"The result after applying log() function on above given second number\",\r\n      gvn_numb2, \" = \", math.log(gvn_numb2))\r\n# Apply math.log() function to the given list element and print it.\r\nprint(\r\n    \"The result after applying log() function on given list element gvnlst[1] = \", math.log(gvn_lst[1]))\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The result after applying log() function on above given first number 1  =  0.0\r\nThe result after applying log() function on above given second number 6  =  1.791759469228055\r\nThe result after applying log() function on given list element gvnlst[1] =  1.6094379124341003<\/pre>\n<h3 id=\"Using_Built-in_Functions_(User_Input)\">Method #2: Using Built-in Functions (User Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import math module using the import keyword.<\/li>\n<li>Give the list as user input using list(),map(),input(),and split() functions.<\/li>\n<li>Store it in a variable.<\/li>\n<li>Give the first number as user input using the float(input()) function and store it in a variable.<\/li>\n<li>Apply math.log() function to the given first number to get the natural logarithm or the base logarithm of a given number.<\/li>\n<li>Store it in another variable.<\/li>\n<li>Print the above result.<\/li>\n<li>Similarly, do the same for the other number.<\/li>\n<li>Apply the math.log() function to the given list element and print it.<\/li>\n<li>The Exit of Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Import math module using the import keyword.\r\nimport math\r\n# Give the list as user input using list(),map(),input(),and split() functions.\r\n# Store it in a variable.\r\ngvn_lst = list(map(float, input(\r\n    'Enter some random List Elements separated by spaces = ').split()))\r\n# Give the first number as user input using the float(input()) function\r\n# and store it in a variable.\r\ngvn_numb1 = float(input(\"Enter some random number = \"))\r\n# Apply math.log() function to the given first number to get the natural logarithm\r\n# or the base logarithm of a given number.\r\n# Store it in another variable.\r\nfnl_rslt = math.log(gvn_numb1)\r\nprint(\"The result after applying log() function on above given first number\",\r\n      gvn_numb1, \" = \", fnl_rslt)\r\n# similarly do the same for the other number.\r\ngvn_numb2 = float(input(\"Enter some random number = \"))\r\nprint(\"The result after applying log() function on above given second number\",\r\n      gvn_numb2, \" = \", math.log(gvn_numb2))\r\n# Apply math.log() function to the given list element and print it.\r\nprint(\r\n    \"The result after applying log() function on given list element gvnlst[2] = \", math.log(gvn_lst[2]))\r\n\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random List Elements separated by spaces = 4 5 3 1 2\r\nEnter some random number = 7\r\nThe result after applying log() function on above given first number 7.0 = 1.9459101490553132\r\nEnter some random number = 9\r\nThe result after applying log() function on above given second number 9.0 = 2.1972245773362196\r\nThe result after applying log() function on given list element gvnlst[2] = 1.0986122886681098<\/pre>\n<p>Know all about Mathematical Functions in Python by going through our <a href=\"https:\/\/python-programs.com\/python-built-in-functions\/#Python_Mathematical_Methods_Examples\">Python Mathematical Methods Examples<\/a> well explained step by step.<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-program-for-gamma-function\/\">Python gamma() Function with Examples<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-for-acos-function\/\">Python acos() Function with Examples<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-for-asin-function\/\">Python asin() Function with Examples<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-for-atan-function\/\">Python atan() Function with Examples<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In the previous article, we have discussed Python Program for expm1() Function log() Function in Python: The math.log() method returns the natural logarithm of a number or the base logarithm of a number. Syntax: math.log(x,\u00a0base) Parameters: x: This is required. It is a number. It Specifies the value for which the logarithm should be calculated. &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-program-for-log-function\/\"> <span class=\"screen-reader-text\">Python Program for log() Function<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Program for log() Function - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/python-program-for-log-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Program for log() Function - Python Programs\" \/>\n<meta property=\"og:description\" content=\"In the previous article, we have discussed Python Program for expm1() Function log() Function in Python: The math.log() method returns the natural logarithm of a number or the base logarithm of a number. 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