The log of negative real values is equal to the log of the positive value, plus (pi*1i) -- that is the result is complex. 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.

Python program to plot logarithmic axes using matplotlib. The process to plot logarithmic axes is extremely similar to regular plotting except for one line of code which is specifying the type of axes as ‘log’. For demonstrating this, we will plot the powers of 10 against their exponents.

[counts,xb]=hist(data(:,3),nbins); %IMHIST ONLY HANDLES 8 & 16 BIT IMAGES, NOT 12BIT bar(log10(xb),counts, 'r' , 'EdgeColor' , 'r' ); example. Y = log10 (X) returns the common logarithm of each element in array X . The function accepts both real and complex inputs. For real values of X in the interval (0, Inf ), log10 returns real values in the interval ( -Inf , Inf ).

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Dear all, an annoying issue when plotting on log scales, is apparently not being able to control the format of axis tick labels. For example: given XTick = [0.1,1,10,30]; I want to manually set my own labels, e.g. XTickLabels = num2str(10^-1, 10^0, 10^1, 10^-1]. But now I would like to use a log axis for the frequency axis since my signal covers many decades in frequency content. I realize the I can just form 'log10(f)' and plot it as a linear axis but this is difficult to interpret when analyzing the plot (e.g. what is the freq if log10(f)=0.4 ?) Is there anyway to get a genuine log axis (1, 10 100, 1000) 1、log10函数：求以10为底的对数2、用法说明 y = log10(x) 函数对数组x的元素逐个进行以10为底的对数运算。y = a+b*i，有log10(y) = log10(abs(y))+i*atan2(b,a)3、举例说明>> x = 20x = 20>> y = log10(x)y = 1.3010>> x When you choose "log" as the scale for an axis, Matlab either chooses to use log10(x) or -log10(-x) as the transform, depending on whether your data is in the positive or negative domain. As you've found, you can't have both at the same time because both halves map data into the [-inf inf] space.

Sometimes, when the "raw" values in the yticks are very small, matlab y axis automatically toggles to scientific notation, whereby the power of ten giving the order of magnitude appears in the top left corner, and the yticks are given in units of that power.

% data x = -3:0.1:3; y = sign(x).*10.^abs(x); % scaling function scale = @(x) sign(x).*log10(abs(x)); N = 7; % number of ticks desired % picking of adequate values for the labels TickMask = linspace(1,numel(y),N); YTickLabels = y(TickMask); % scale labels and plotdata, remove NaN ->inconsistency, do you really want that? example. Y = log10 (X) returns the common logarithm of each element in array X . The function accepts both real and complex inputs.

This MATLAB function plots x- and y-coordinates using a base-10 logarithmic scale on the x-axis and a linear scale on the y-axis.

Alternatively, you can set the ‘YScale’ property on the axes: set(gca, 'YScale' , 'log' ) Se hela listan på educba.com And if the data was originally log10(~something~). Can I change the axes in a way that I will see 10^(~something~) in both axes? Meaning the original data, althogh I rescieved it as log(A) Vs log (B) (I didn't get the figure in loglog scailing, it's in linear scailing but the data itself is a log)? Would be very helpful! Force scientific notation in axes. Sometimes, when the "raw" values in the yticks are very small, matlab y axis automatically toggles to scientific notation, whereby the power of ten giving the order of magnitude appears in the top left corner, and the yticks are given in units of that power.

Maybe I need another type of plot? I'm a complete newbe in matlab. I want the function to have log scale at the same time the X labels have values of X which are [1 2 4 8 16 32 64]. Matlab scatter plot set x-axis and y-axis.
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'0.1, 1, 10, 0.1'). Is there a way to control directly the format of axis tick labels, or I have to work it around using a … The use of normalized units keeps the text in the same location, even if you change the axis limits. If you want the text to reflect the order of magnitude of the axis limits, you may need to do some of the log10 processing demonstrated above first. Y = log10(X) returns the common logarithm of each element in array X.The function accepts both real and complex inputs. For real values of X in the interval (0, Inf), log10 returns real values in the interval (-Inf,Inf).For complex and negative real values of X, the log10 function returns complex values.

I'm a complete newbe in matlab.
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Right now MATLAB either omits the last label if XTickLabelModel is 'auto' or can display strings of the type '10^X' or can show only numbers as decimals (i.e. '0.1, 1, 10, 0.1'). Is there a way to control directly the format of axis tick labels, or I have to work it around using a text(-) object and switching XTickLabels off?

>> axis  10 juli 2003 — Sammanfattning. Matlab är ett fiffigt programpaket som är allmänt användbart för dig ga logaritmen ln(x) och log10(x) är logaritmen med bas 10, dvs.

semilogx(Y) creates a plot using a base 10 logarithmic scale for the x-axis and a linear scale for the y-axis. It plots the columns of Y versus their index if Y 

Bar Chart Log Axis. Learn more about bar, log log10. Common (base 10) logarithm.

This MATLAB function plots x- and y-coordinates using a base 10 logarithmic scale on the x-axis and the y-axis. 2008-08-27 Right now MATLAB either omits the last label if XTickLabelModel is 'auto' or can display strings of the type '10^X' or can show only numbers as decimals (i.e. '0.1, 1, 10, 0.1'). Is there a way to control directly the format of axis tick labels, or I have to work it around using a … The use of normalized units keeps the text in the same location, even if you change the axis limits.