Plot axis limits

I am wasting my life trying to get the axes to go from a to b (ONLY!).

For example, the data file goes from 290 to 420 (variable) in steps of .02. I plot all rows and one column. There are 6500 rows. But Matlab insists on making the axes go from 0 to 7000 leaving whitespace at the end. If I add a line command within the x axis range, sometimes it creates two lines instead of one. Why is plotting so flakey?

Answer 1

[Honglei Chen]

You can give following command a try

axis tight

If you want more control, you can use axis command to control the limits

doc axis

HTH

[Steve D]

Doesn't work, tried it.

Answer 2

[Jonathan]

You can set the axis limits using ylim([290 420]) or xlim([290 420]).

[Steve D]

Doesn't work either, tried the axis command every which way.

[Jonathan]

Please post your original code.

[Steve D]

Here is a sample section:

% Read Parmeters:

fid = fopen(temp, 'r'); % fn = function parameter

frewind(fid);

for i=1:5 trash=fgetl(fid); end; % skip 1st 5 lines

params = cell2mat( textscan(fid, '%f',19) ); % read line 6

stimre = params(5); % grab the re stim start time parameter

stimredur = params(6); % and the duration

strest = num2str(params(5)); % convert to strings for labeling plots

stimcx = params(12); % grab the cx stim start time parameter

stimcxdur = params(13); % and the duration

stcxst = num2str(params(12)); % convert to strings for labeling plots

cxno = fscanf(fid, '%d',1); % read number of each cell to plot for each pop

cxnost = num2str(cxno); % and convert to a string for plot labels

inno = fscanf(fid, '%d',1);

innost = num2str(inno);

tcno = fscanf(fid, '%d',1);

tcnost = num2str(tcno);

reno = fscanf(fid, '%d',1);

renost = num2str(reno);

startplot1 = fscanf(fid, '%d',1); % read start and end time for each plot

endplot1 = fscanf(fid, '%d',1);

endplot1 = endplot1; % decrement to ensure plots do not have white space

st1 = num2str(startplot1); % convert to string for plot labels

et1 = num2str(endplot1);

startplot2 = fscanf(fid, '%d',1);

endplot2 = fscanf(fid, '%d',1);

endplot2 = endplot2;

st2 = num2str(startplot2);

et2 = num2str(endplot2);

startplot3 = fscanf(fid, '%d',1);

endplot3 = fscanf(fid, '%d',1);

endplot3 = endplot3;

st3 = num2str(startplot3);

et3 = num2str(endplot3);

startplot4 = fscanf(fid, '%d',1);

endplot4 = fscanf(fid, '%d\n',1);

endplot4 = endplot4;

st4 = num2str(startplot4);

et4 = num2str(endplot4);

msb = 5; % millisenconds per bin

mst = num2str(msb); % string version for bin plot labels

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if endplot4 > 0

figure(9);

hold on;

set(gcf,'Name', paramline);

subplot(4,1,1);

plot(time_zcx(1:(end-wsp*50),cxno));

title(['CX Cell ', cxnost ' zoom 50x: ' paramline], 'Color', [.5 0 0], 'FontWeight', 'bold');

xlabel(['time in 20 us increments from ' st4 'ms to ' et4 'ms stimulating CX at ' stcxst 'ms and/or RE at ' strest 'ms']);

ylabel('mv');

if (stimcx >= startplot4) && (stimcx <= endplot4)

line([(stimcx-startplot4)*50 (stimcx-startplot4)*50], get(gca, 'YLim'), 'Color', 'g');

end

if (stimre >= startplot4) && (stimre <= endplot4)

line([(stimre-startplot4)*50 (stimre-startplot4)*50], get(gca, 'YLim'), 'Color', 'r');

end

subplot(4,1,2);

plot(time_zin(1:(end-wsp*50),inno)');

title(['IN Cell ', innost ' zoom 50x: ' paramline], 'Color', [.5 0 0], 'FontWeight', 'bold');

xlabel(['time in 20 us increments from ' st4 'ms to ' et4 'ms stimulating CX at ' stcxst 'ms and/or RE at ' strest 'ms']);

ylabel('mv');

if (stimcx >= startplot4) && (stimcx <= endplot4)

line([(stimcx-startplot4)*50 (stimcx-startplot4)*50], get(gca, 'YLim'), 'Color', 'g');

end

if (stimre >= startplot4) && (stimre <= endplot4)

line([(stimre-startplot4)*50 (stimre-startplot4)*50], get(gca, 'YLim'), 'Color', 'r');

end

subplot(4,1,3);

plot(time_ztc(1:(end-wsp*50),tcno)');

title(['TC Cell ', tcnost ' zoom 50x: ' paramline], 'Color', [.5 0 0], 'FontWeight', 'bold');

xlabel(['time in 20 us increments from ' st4 'ms to ' et4 'ms stimulating CX at ' stcxst 'ms and/or RE at ' strest 'ms']);

ylabel('mv');

if (stimcx >= startplot4) && (stimcx <= endplot4)

line([(stimcx-startplot4)*50 (stimcx-startplot4)*50], get(gca, 'YLim'), 'Color', 'g');

end

if (stimre >= startplot4) && (stimre <= endplot4)

line([(stimre-startplot4)*50 (stimre-startplot4)*50], get(gca, 'YLim'), 'Color', 'r');

end

subplot(4,1,4);

plot(time_zre(1:(end-wsp*50),reno)');

title(['RE Cell ', renost ' zoom 50x: ' paramline], 'Color', [.5 0 0], 'FontWeight', 'bold');

xlabel(['time in 20 us increments from ' st4 'ms to ' et4 'ms stimulating CX at ' stcxst 'ms and/or RE at ' strest 'ms']);

ylabel('mv');

if (stimcx >= startplot4) && (stimcx <= endplot4)

line([(stimcx-startplot4)*50 (stimcx-startplot4)*50], get(gca, 'YLim'), 'Color', 'g');

end

if (stimre >= startplot4) && (stimre <= endplot4)

line([(stimre-startplot4)*50 (stimre-startplot4)*50], get(gca, 'YLim'), 'Color', 'r');

end

hold off;

saveas(gcf,[fprefix '_sc_TR4.fig']);

saveas(gcf,[fprefix '_sc_TR4.png'], 'png');

saveas(gcf,[fprefix '_sc_TR4.eps'], 'eps');

end