matlab plot log scale

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

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