0 Comments. Sign in to comment. This term refers to the fact that the plot is logarithmically scaled in both axes. Based on your location, we recommend that you select: . 0 Comments. Show Hide all comments. Show Hide all comments. I am wondering how to plot in MATLAB with a logarithmic scale. digital filter freqz plot. 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. There are two ways to make a log-log plot in MATLAB. The most common base of any logarithmic equation is always considered to be 10 if it is not specified. The graph will be linear with a logarithmic y-axis. Problem is when I can have one or the other, y=-3 and my function or I can have an x axis log scale. The freqz(z,p) gives the plot of magnitude in dB (log scale) versus the normalized frequency. MATLAB: Linear Scale of a Frequency Response Plot (freqz) – Digital Filter. Logarithms can be written as the inverse of an exponential equation. However, I would like to have linear scale (0-1 for the y-axis), is it doable? Sign in to answer this question. 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. Similarly, you can apply the same for x-axis by using pyplot.xscale(‘log’). [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. Can anyone help me please to do this? The first is to use the plot command to plot log(y) vs. log(x) on a linear scale. Introduction to Log Plot Matlab. Choose a web site to get translated content where available and see local events and offers. Select a Web Site. Sign in to answer this question. If yes, please assist me how to do it. plot( log10(x), log10(y)) Alternatively, you can use the loglog command to make a plot with log-scale axes: loglog( x, … Mar 18, 2019 The log of negative real values is equal to the log of the positive value, plus (pi*1i) -- that is the result is complex. Summing up, I need to do one of the following: Find a way to set the logarithmic scale programmatically and let matlab worry about the isolines. x = [1 0.1 0.01 0.001] y = [10 60 120 180] I want to plot x-axis in logarithmic scale. 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. I am wondering how to plot in MATLAB with a logarithmic scale. Log Plots are the two-dimensional graphs that have a logarithmic scale in both horizontal and vertical axes. That’s all that needs to be done to plot a graph with a logarithmic scale. 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. Can anyone help me please to do this? Sign in to comment. These are my data. The scale is very useful when displaying the data over many order. 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. 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. Without the logarithmic scale, the data that we plotted would show a curve with an exponential rise. These are my data. 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. without embedded MATLAB functions. x = [1 0.1 0.01 0.001] y = [10 60 120 180] I want to plot x-axis in logarithmic scale. 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