Octave - Revision history

Adminguy at 06:52, 30 December 2020

2020-12-30T06:52:02Z

Adminguy: /* invert Y axis */

2020-06-02T03:05:04Z

invert Y axis

Adminguy at 03:04, 2 June 2020

2020-06-02T03:04:39Z

Adminguy at 06:50, 27 May 2020

2020-05-27T06:50:24Z

Adminguy at 06:40, 27 May 2020

2020-05-27T06:40:16Z

Adminguy: Created page with "Tips on GNU Octave ==argv==

 # NOTE: numbers passed into argv are treated as (ascii) char # must convert with str2num, or some other e.g. (call script with ./script 2..."

2020-05-27T06:36:59Z

Created page with "Tips on GNU Octave ==argv== <pre> # NOTE: numbers passed into argv are treated as (ascii) char # must convert with str2num, or some other e.g. (call script with ./script 2..."

New page

Tips on GNU Octave

==argv==
<pre>
# NOTE: numbers passed into argv are treated as (ascii) char
# must convert with str2num, or some other
e.g. (call script with ./script 20
#!/usr/bin/octave

arg_list = argv();
HOWLONG=arg_list{1}

# NOTE: numbers passed into argv are treated as (ascii) char
# which means 0 is around 40 in binary.
# must convert with str2num, or some other
# cast() will not fix this (as it casts the binary)

display("How long is: ")
class(HOWLONG)
news2 = str2num(HOWLONG)
display("news2 is now: ")
class(news2)
</pre>

==If Loop==
<pre>
#don't forget quotes on numbers here
#if HOWLONG == "1"
# SQLQUERYNUM = 288;
#elseif HOWLONG == "3"
# SQLQUERYNUM = 288 * 3;
#elseif HOWLONG == "7"
# SQLQUERYNUM = 288 * 7;
#elseif HOWLONG == "14"
# SQLQUERYNUM = 288 * 14;
#else
#display("incorrect time to search")
#display("Try, 1, 3, 7, 14")
#exit();
#en</pre>

@@ Line 1: / Line 1: @@
 Tips on GNU Octave
+* Get some books
+* It's inefficient on the CPU, so use it for fun and prototyping.
 ==argv==

@@ Line 79: / Line 79: @@
 # installing debian 10 resolved this (could also have used backports in stretch).
-===Database Package with Devuan 9===
+==Database Package with Devuan 9==
 Devuan ascii has octave 4.0. ascii backports has 4.4, but not octave-struct (without breaking in devuan). Must migrate to Devuan Beowulf to get full octave 4.4.

← Older revision		Revision as of 03:04, 2 June 2020
Line 78:		Line 78:
	# I dug into the bug tracker, and also dl'd source code. looks like i have an old version		# I dug into the bug tracker, and also dl'd source code. looks like i have an old version
	# installing debian 10 resolved this (could also have used backports in stretch).		# installing debian 10 resolved this (could also have used backports in stretch).
		+
		+	===Database Package with Devuan 9===
		+	Devuan ascii has octave 4.0. ascii backports has 4.4, but not octave-struct (without breaking in devuan). Must migrate to Devuan Beowulf to get full octave 4.4.

← Older revision		Revision as of 06:40, 27 May 2020
Line 44:		Line 44:
	#exit();		#exit();
	#en</pre>		#en</pre>
		+
		+
		+	==sprintf==
		+	#basic sprintf (req's quotes)
		+	#val1="test"
		+	#val2="something"
		+	#sprintf("%s%s",val1,val2)
		+	#if you want to assign to variable, sprintf(variable,"%s%s",val1,val2)
		+	#won't work, but ofc
		+	# newvar = sprintf("%s%s",val1,val2)
		+	#will
		+
		+	==call function with parenthesis or not==
		+	#dynamically generate print filename at runtime
		+	#https://www.mathworks.com/matlabcentral/answers/148-how-do-i-dynamically-generate-a-file-name-for-save-in-matlab
		+	#essentially, if you myvar = sprintf(something...)
		+	#you have to print(myvar)
		+	#not print myvar
		+	#so parenthesis are required (but they are not always required for e.g. print)
		+
		+	==invert Y axis==
		+	#display(p(:,2)) (all times)
		+	#display(p(:,1)) (all values)
		+	#vals = p(:,1)
		+	#EDIT: the below was a bug.
		+	#it appears you can't invert the (p(:,1)) in plot, with either common commands used to invert Y axis.
		+	# these cmds are: axis(ij) after plot, as well as set(gca,'YDir','reverse');, and plot (flipud(p(:, 2)), p(:, 1)) (this latter one inverts only the X axis, not Y
		+	#so instead, send it to a new variable
		+	# flipud(vals)
		+	# EDIT: this isn't what I want to do. it flips the array upside down. instead, I want the high end
		+	# of the y axis to be at the bottom, and the low numbers to be at the top.
		+	# https://savannah.gnu.org/bugs/?47223
		+	# I dug into the bug tracker, and also dl'd source code. looks like i have an old version
		+	# installing debian 10 resolved this (could also have used backports in stretch).

@@ Line 28: / Line 28: @@
-==If Loop==
+==if loop==
 <pre>
 #don't forget quotes on numbers here