octave

问题 I've install Octave and the fuzzy logic toolkit to work with Fuzzy Inference Systems. pkg install fuzzy-logic-toolkit-0.4.5.tar.gz For information about changes from previous versions of the fuzzy-logic-toolkit package, run 'news fuzzy-logic-toolkit'. >> pkg list Package Name | Version | Installation directory ---------------------+---------+----------------------- fuzzy-logic-toolkit | 0.4.5 | /home/bgarcial/octave/fuzzy-logic-toolkit-0.4.5 But ... How to can I use the toolkit? I type pkg

问题 I am calling Octave script from PHP and passing parameters to it. But I get the unexpected output. The PHP code I'm using to pass arguments and call the Octave script is: $a=8; $b=3; $cmd = "C:\Octave\Octave4\bin\octave-cli C:\wamp\www\dspace\add.m $a $b"; $ex = passthru($cmd, $op); var_dump($ex); My Octave script: arglist = argv(); a = arglist{1}; b = arglist{2}; function f (a,b) a + b endfunction printf(f(a,b)); The output get is: ans = 107 Expected output is: 11 How can I fix this? 回答1:

问题 While using Octave in c++ code, if the octave value list contained a double matrix, I would retrieve it as out(0).matrix_value() ( out is the octave_value_list ). Is there something similar for symbolic variable/expression? I do not want to retrieve it as a string value, as I cannot use the string for further calculations. 来源： https://stackoverflow.com/questions/32068222/octave-symbolic-expression

问题 I'm totally new to Octave but thought I'd give it a try since I need to create a box and whisker plot from a raster image with height values. I've managed to export my GeoTIFF image to some sort of .CSV-file, it can be accessed from here and it uses "." for decimals and ";" as the delimiter between cells. When I run dlmread ("test.csv",, ";", 0, 0) the results indicate that the data is split up in multiple columns? And on top of that I have zero-values (0) which isn't present in test.csv, see

问题 I am trying to solve the following two equations using Octave: eqn1 = (wp/Cwc)^(2*N) - (1/10^(0.1*Ap))-1 == 0; eqn2 = (ws/Cwc)^(2*N) - (1/10^(0.1*As))-1 == 0; I used the following code: syms Cwc N eqn1 = (wp/Cwc)^(2*N) - (1/10^(0.1*Ap))-1 == 0; eqn2 = (ws/Cwc)^(2*N) - (1/10^(0.1*As))-1 == 0; sol = solve(eqn1 ,eqn2, Cwc, N) ws , wp , As , and Ap are given as 1.5708 , 0.31416 , 0.5 , 45 respectively. But I am getting the following error: error: Python exception: NotImplementedError: could not

问题 is there an easy way in octave to load data from a csv in a data structure similar to dataframes in R? I tries csvread dlmread but octave keeps reading test a imaginary numbers, plus I'd like to have column's headers as references. I saw that there are some examples online which see way too twisted, how is it possible that there is not a function or something similar to dataframe of R? I say a package called dataframe but I can't seem to figure out how it works. Any tip or suggestion? csvread

问题 I'm plotting z values, 0 to 10, on a contour plot. When I include data 1 or greater, I obtain a contour plot. Like the following: longitude = [80 82 95] latitude = [30 32 35] temp = [1 4 6; 1 2 7; 3 5 7] contourf(longitude,latitude,temp) Now, I want to plot the ZERO VALUE also on the contour plot. While I was expecting one color representing the zero value, instead I obtained a white square. longitude = [80 82 95] latitude = [30 32 35] temp = [0 0 0; 0 0 0; 0 0 0] contourf(longitude,latitude

问题 I need to use the following method to work with the library libSVM: Qt+Octave+libSVM+(Linux/Mac). LibSVM works with Octave without Qt, but I need to use Qt to run built-in and external functions Octave. SVMTrain is a mex-function and when calling it occurs segmentation fault 11. I don't know how to solve this problem, please help to resolve this. SOURCES += \ main.cpp LIBS += -L /usr/local/Cellar/octave/4.2.1_6/lib/octave/4.2.1 -loctave -loctinterp INCLUDEPATH += /usr/local/Cellar/octave/4.2

问题 I am using Octave 3.8.1, a Matlab-like program. I'd like to generalize 1/x to the case where x may be a scalar or a matrix. Replacing 1/x with inv(x) or pinv(x) works for most x , except: octave:1> 1/inf ans = 0 octave:2> pinv([inf]) ans = NaN octave:3> inv([inf]) warning: inverse: matrix singular to machine precision, rcond = 0 ans = Inf Should I convert NaN to 0 afterwards to get this to work? Or have I missed something? Thanks! 回答1: The Moore–Penrose pseudo inverse, which is the basis for

问题 In Octave there is the problem that with fltk and qt greek letters in figures are not printed, only with gnuplot as graphics_toolkit. But then with gnuplot all lines are solid, no dashed lines. I found a page which says that other linestyles can be enabled: http://wiki.octave.org/Enable_%22linestyle%22_functionality_for_Gnuplot%27s_x11_terminal I added the lines there to my ~/.Xdefaults and did xrdb -merge .Xdefaults as said there, but no success. I am running octave 4.0.2 on Ubuntu 16.04.