MATLAB: Plotting more than one graph

figuregraphMATLAB

I am attempting to produce 2 graphs (see below) however after running the code only one graph (Stock Price) is being displayed. How can I get them both to show?

      % LogPriceReturn Graph
      x = Timestep; % sets x axis equal to the 'Timestep'
      y = LogPriceReturn; % sets y axis equal to the 'LogPriceReturn'
      plot(x,y, 'Marker','o', 'MarkerFaceColor','black'); hold on % plots graph of x and y, using 'hold on' command to retain each loop result
      title('Log Price Return'); % sets the title of graph
      xlabel('Timestep'); % sets x-axis label of graph
      ylabel('Log Price Return Graph'); % sets y-axis label of graph
      axis([1 n -1.5 1.5]); % formats axis limits
      %StockPrice Graph
      x = Timestep;
      y = StockPrice;
      plot(x,y, 'Marker','o', 'MarkerFaceColor', 'black'); hold on
      title('Stock Price');
      xlabel('Timestep');
      ylabel('Stock Price');
      axis([1 n -1.5 1]);

Best Answer

Before you start the second plot use

hold on

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MATLAB: Plot graphs at conclusion of a ‘for loop’

For my purposes here (and since you didn’t post it), I’m using ‘k’ as the loop index. So assume this loop:

for k = ...
    % LogPriceReturn Graph
    x1(k) = Timestep; % sets x axis equal to the 'Timestep'

    y1(k) = LogPriceReturn; % sets y axis equal to the 'LogPriceReturn'
    x2(k) = Timestep; % sets x axis equal to the 'Timestep'
    y2(k) = StockPrice; % sets y axis equal to the 'StockPrice'
end
      figure(1); % opens a new figure for graph

      plot(x1,y1, 'Marker','o', 'MarkerFaceColor','black'); hold on % plots graph of x and y, using 'hold on' command to retain each loop result

      title('Log Price Return'); % sets the title of graph

      xlabel('Timestep'); % sets x-axis label of graph

      ylabel('Log Price Return Graph'); % sets y-axis label of graph

      axis([1 n -1 1]); % formats axis limits

      % StockPrice Graph
      figure(2) % opens a new figure for graph
      plot(x2,y2, 'Marker','o', 'MarkerFaceColor', 'black'); hold on % plots graph of x and y, using 'hold on' command to retain each loop result
      title('Stock Price'); % sets the title of graph
      xlabel('Timestep'); % sets x-axis label of graph
      ylabel('Stock Price'); % sets y-axis label of graph
      axis([1 n -inf inf]); % formats axis limits

NOTE — This is UNTESTED CODE. It should work, but may require minor modification.

MATLAB: How to create a loglog plot out of an array? I have a 2xn array of all the data points called points & the loglog plot is showing the same graph as the normal plot tool.

When you did the "hold on", you implicitly froze the log vs normal scale of the plot axes, so the loglog() will be treated the same as the plot().

Any one axes only has a single XScale and a single XScale. It is not possible for a single axes to display a plot in normal scale and log scale at the same time. You can use plotyy or the newer yyaxis calls to create two axes, one for each of the scales.

But you need to avoid using "hold on" before loglog() -- that or else you need to

set(gca, 'XScale', 'log', 'YScale', 'log')

which is what loglog() mostly does internally.

Best Answer

Related Solutions

MATLAB: Plot graphs at conclusion of a ‘for loop’

MATLAB: How to create a loglog plot out of an array? I have a 2xn array of all the data points called points & the loglog plot is showing the same graph as the normal plot tool.

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