gnuplot 热图：数据出现“倾斜”
我需要一些帮助
我有一个巨大的文件，其中包含 256 个频率，其幅度每 3 秒一次，这意味着对于每个特定时间（即 18:04:01），有 256 行。第一列是时间：YYYY-MM-DD-HH-MM-SS，第二列是频率，第三列是幅度值。每列都用空格分隔
2022-02-27-18:39:57 1.823047180175781250e+02 -4.882478713989257812e+01
*<256 lines>*
2022-02-27-18:39:57 1.6047180175781250e+02 -4.882478713989257812e+01
2022-02-27-18:39:54 1.823047180175781250e+02 -4.533270263671875000e+01
*<256 lines>*
2022-02-27-18:39:54 1.6047180175781250e+02 -4.882478713989257812e+01
这是我用来绘制此图的 gnuplot 代码：
clear
reset
reset session
set timestamp "Generated: %Y-%m-%d %H:%M:%S" top font 'Arial,16'
set datafile separator " "
set datafile missing "nan"
set term pngcairo
set terminal png size 1500,800
set title "$systemName \n \nSpectrum\n Most recently appended: $file_most_current_pwr" font 'Consolas,19' noenhanced
set cblabel "Amplitude dB" offset 3 font 'Consolas, 15'
set cbtics scale 0 font 'Arial,16'
#set cbrange [:-40]
set palette rgbformulae 22,13,-31
unset key
set timefmt "%Y-%m-%d-%H:%M:%S"
set xdata time
set format x "%H:%M:%S"
set ylabel 'MHz' font 'Arial,19' offset 0,2
set xlabel 'Time' font 'Arial,19'
set output "/var/www/html/and_power_plot.png"
plot "/var/www/html/Data_Archive/current_master_PWR_data.txt" using 1:2:3 with image
但是，我得到的热图看起来“倾斜”。此外，当我将更多数据附加到文件时，我收到此错误：
Visible pixel grid has a scan line longer than previous scan lines
这是图表：
建议吗？
I need some help
I have huge file that contains 256 frequencies with their amplitudes every 3 seconds, meaning for each specific time (i.e. 18:04:01), there is 256 lines. The first column is the time: YYYY-MM-DD-HH-MM-SS, the second columns is the frequency, and the third column is the amplitude value. Each column is separated with a space
2022-02-27-18:39:57 1.823047180175781250e+02 -4.882478713989257812e+01
*<256 lines>*
2022-02-27-18:39:57 1.6047180175781250e+02 -4.882478713989257812e+01
2022-02-27-18:39:54 1.823047180175781250e+02 -4.533270263671875000e+01
*<256 lines>*
2022-02-27-18:39:54 1.6047180175781250e+02 -4.882478713989257812e+01
Here is the gnuplot code that I am using to plot this:
clear
reset
reset session
set timestamp "Generated: %Y-%m-%d %H:%M:%S" top font 'Arial,16'
set datafile separator " "
set datafile missing "nan"
set term pngcairo
set terminal png size 1500,800
set title "$systemName \n \nSpectrum\n Most recently appended: $file_most_current_pwr" font 'Consolas,19' noenhanced
set cblabel "Amplitude dB" offset 3 font 'Consolas, 15'
set cbtics scale 0 font 'Arial,16'
#set cbrange [:-40]
set palette rgbformulae 22,13,-31
unset key
set timefmt "%Y-%m-%d-%H:%M:%S"
set xdata time
set format x "%H:%M:%S"
set ylabel 'MHz' font 'Arial,19' offset 0,2
set xlabel 'Time' font 'Arial,19'
set output "/var/www/html/and_power_plot.png"
plot "/var/www/html/Data_Archive/current_master_PWR_data.txt" using 1:2:3 with image
However, I am getting a heatmap that looks "slanted". In addition, I received this error when I append further data to the file:
Visible pixel grid has a scan line longer than previous scan lines
Here is the graph:
Any advice ?
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评论（1）
好吧，事实证明数据每行之间必须有一个空行，例如，而不是：
需要像这样：
Ok, so it turns out that the data has to have a blank line between each line, for example, instead of:
needs to be like this: