[C, h1] = contourf(X, Y, Z, 'ZScale', 'Log'); clabel(C,h1); and get the picture at the bottom with labels 10, 10^5, 10^10, etc. 0 Comments. I know about semilogy, semilogx and loglog functions, but I'd like to understand how to perform conversion from linear scale to logarithmic scale manually, i.e. I need to plot a line at y=-3 on my graph that has two functions plotted on a log scale on the x axis. Hey guys I'm blundering through MATLAB here, I haven't officially learnt it and my Lecturer expects me to know how to use it. without embedded MATLAB functions. The freqz(z,p) gives the plot of magnitude in dB (log scale) versus the normalized frequency. Show Hide all comments. Introduction to Log Plot Matlab. These are my data. An frequently-used method is transforming data by the formular t = sign(x)*log(abs(x)), then plot the (t,y) instead of (x,y), and modify the yTickLabel manually. Can anyone help me please to do this? If yes, please assist me how to do it. I am wondering how to plot in MATLAB with a logarithmic scale. These are my data. Sign in to answer this question. There are two ways to make a log-log plot in MATLAB. Similarly, you can apply the same for x-axis by using pyplot.xscale(‘log’). That’s all that needs to be done to plot a graph with a logarithmic scale. I am wondering how to plot in MATLAB with a logarithmic scale. This term refers to the fact that the plot is logarithmically scaled in both axes. Sign in to comment. plot( log10(x), log10(y)) Alternatively, you can use the loglog command to make a plot with log-scale axes: loglog( x, … The graph will be linear with a logarithmic y-axis. Choose a web site to get translated content where available and see local events and offers. Logarithms can be written as the inverse of an exponential equation. x = [1 0.1 0.01 0.001] y = [10 60 120 180] I want to plot x-axis in logarithmic scale. Sign in to answer this question. Based on your location, we recommend that you select: . Can anyone help me please to do this? When you set YScale to log, then internally it would take the log of the negative values you have, and would found that the log is complex. x = [1 0.1 0.01 0.001] y = [10 60 120 180] I want to plot x-axis in logarithmic scale. Mar 18, 2019 However, I would like to have linear scale (0-1 for the y-axis), is it doable? 0 Comments. Log Plots are the two-dimensional graphs that have a logarithmic scale in both horizontal and vertical axes. Select a Web Site. If you use xlim([5000 8000]) the plots are superficially the same because the range of x-values is so limited the difference in scaling between the log and linear axes isn't much at all. Show Hide all comments. The most common base of any logarithmic equation is always considered to be 10 if it is not specified. loglog - logarithmic plot In this example we are going to demonstrate how to use the ' loglog ' function included in Matlab to produce non-linear plots. digital filter freqz plot. 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