Natural Logarithms Have Simpler Derivatives Than Other Sys- tems of Logarithms. I consider it “ natural” because e is the universal rate of growth, so ln could be considered the “universal” way to figure out how long things take to grow. Note that the variable “leg_str” is a cell, not an array (It seems “legend.m” deals strings in cell format).Where to from here? I hope the natural log makes more sense - it tells you the time needed for any amount of exponential growth. One way to automate this legend generation is leg_str = cell ( 1, length ( arr )) % It should be a cell in MATLAB rather an array for ii = 1 : length ( arr ) leg_str ( ii ) = end leg = legend ( leg_str, 'fontsize', 16 ) That is, I have five curves, and each curve corresponds to “a=1”, “a=2”, “a=3”, “a=4” and “a=5” in legend. For example, I have an array arr = 1 : 1 : 5 Īnd I need to make the values in variable “‘arr’” as the legend entries. Sometimes I need to add automatically generated legend to the plot. One can create another function ‘func2.m’ in which y = func2 ( x, a, b ) y = sin ( x ) - a * x - b endĪnd in the main function, solve this equation: sol = fsolve ( ( x ) func2 ( x, a, b ), 0 ) Automatic legend generation with an array ![]() In this case, the main function needs to pass the parameters ‘a’ and ‘b’ to the equation. Ln -s /usr/lib/x86_64-linux-gnu/libgfortran.so.3įor example, if one needs to solve an equation ‘sin(x)=a*x+b’ within the main function, while ‘a’ and ‘b’ are calculated previously in the main function. The error usually goes like this in a fresh installed Matlab 2011b on UbuntuĬd /home/user/MATLAB/R2011b/sys/os/glnxa64 One can use the “‘Visible’” axis property to remove ALL axes, including tick marks and labels: set ( gca, 'Visible', 'off' )Ī quick and dirty way to get rid of just one axis: remove all tick marks and then set its color to white (or whatever the current background colour may be: set ( gca, 'YTick' ,) set ( gca, 'YColor', 'w' ) Matlab 2011b starting error: “libc.so.6” not found NOTE: One can also use “ importdata” function in MATLAB. (Installation of ‘xfonts-100dpi’ and ‘xfonts-75dpi’ also solved the default messy fonts problem of Google Earth in Kubuntu/Xubuntu.) Import multiple data files into MATLAB workspace files = dir ( '*.txt' ) for i = 1 : length ( files ) eval () end #Ln in matlab install#Sudo apt-get install xfonts-100dpi xfonts-75dpi ![]() ![]() To overcome this problem, one possible solution was to install necessary DPI fonts: This might have something to do with Matlab itself - the fonts in figures were rendered by the old X while fonts outside were done with Java. It happened to my fresh installed Xubuntu 11.10: I could not change the font type and size in a figure. ![]() Last modified: Jun, 2014 A typical plotting script in Matlab x = linspace ( 0, 2 * pi, 100 ) y1 = sin ( x ) y2 = cos ( x ) h_fig = figure ( 1 ) set ( h_fig, 'Position', ) plot ( x, y1, '-', x, y2, '-' ) xlabel ( 'x', 'fontsize', 16 ' ) ylabel ( 'y', 'fontsize', 16 ) set ( gca, 'fontsize', 14, 'xlim', , 'ylim', , 'ytick', ) % set axis properties h_lines = findobj ( gca, 'type', 'line' ) % tweaking the line properties set ( h_lines ( 1 ), 'linewidth', 4, 'color', 'b' ) % h_lines(1) is the last curve in the being plotted (y2 in this case) set ( h_lines ( 2 ), 'linewidth', 2, 'color', 'r' ) % should change the y1 curve properties h_leg = legend ( 'sin(x)', 'cos(x)' ) set ( h_leg, 'fontsize', 16 ) legend boxoff text ( 1.2, 1.2, 'sin(x)', 'fontsize', 20, 'color', 'b' ) text ( 3, - 1.2, 'cos(x)', 'fontsize', 20, 'color', 'r' ) Font size unchangeable in Unix/Linux
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