Question

matlab 基本数据分析函数

最近做课设，要求图像的最大值、最小值、均值、中值、和、标准差、两图像的协方差、相关系数等。大家谁有这些函数的用法请告诉小弟，还有，就是图像在分析时为什么要将其转化为双精度型？
但是有的不需要双精度啊，我试了下，不转的话，好像在求协方差的时候有问题了，另外希望是中文的，尽量有程序的使用格式好一点，呵呵，谢谢各位了

Answer 1

Descriptive Statistics.
bootstrp - Bootstrap statistics for any function.
corrcoef - Correlation coefficient.
cov - Covariance
crosstab - Cross tabulation.
geomean - Geometric mean.
grpstats - Summary statistics by group.
harmmean - Harmonic mean.
iqr - Interquartile range.
kurtosis - Kurtosis.
mad - Median Absolute Deviation.
mean - Sample average (in matlab toolbox).
median - 50th percentile of a sample.
moment - Moments of a sample.
nanmax - Maximum ignoring NaNs.
nanmean - Mean ignoring NaNs.
nanmedian - Median ignoring NaNs.
nanmin - Minimum ignoring NaNs.
nanstd - Standard deviation ignoring NaNs.
nansum - Sum ignoring NaNs.
prctile - Percentiles.
range - Range.
skewness - Skewness.
std - Standard deviation ((in matlab toolbox).
tabulate - Frequency table.
trimmean - Trimmed mean.
var - Variance (in matlab toolbox).

matlab里大部分函数只支持双精度

Answer 2

Descriptive Statistics.

bootstrp - Bootstrap statistics for any function.

corrcoef - Correlation coefficient.

cov - Covariance

crosstab - Cross tabulation.

geomean - Geometric mean.

grpstats - Summary statistics by group.

harmmean - Harmonic mean.

iqr - Interquartile range.

kurtosis - Kurtosis.

mad - Median Absolute Deviation.

mean - Sample average (in matlab toolbox).

median - 50th percentile of a sample.

moment - Moments of a sample.

nanmax - Maximum ignoring NaNs.

nanmean - Mean ignoring NaNs.

nanmedian - Median ignoring NaNs.

nanmin - Minimum ignoring NaNs.

nanstd - Standard deviation ignoring NaNs.

nansum - Sum ignoring NaNs.

prctile - Percentiles.

range - Range.

skewness - Skewness.

std - Standard deviation ((in matlab toolbox).

tabulate - Frequency table.

trimmean - Trimmed mean.

var - Variance (in matlab toolbox).

Answer 3

Descriptive Statistics.
bootstrp - Bootstrap statistics for any function.
corrcoef - Correlation coefficient.
cov - Covariance
crosstab - Cross tabulation.
geomean - Geometric mean.
grpstats - Summary statistics by group.
harmmean - Harmonic mean.
iqr - Interquartile range.
kurtosis - Kurtosis.
mad - Median Absolute Deviation.
mean - Sample average (in matlab toolbox).
median - 50th percentile of a sample.
moment - Moments of a sample.
nanmax - Maximum ignoring NaNs.
nanmean - Mean ignoring NaNs.
nanmedian - Median ignoring NaNs.
nanmin - Minimum ignoring NaNs.
nanstd - Standard deviation ignoring NaNs.
nansum - Sum ignoring NaNs.
prctile - Percentiles.
range - Range.
skewness - Skewness.
std - Standard deviation ((in matlab toolbox).
tabulate - Frequency table.
trimmean - Trimmed mean.
var - Variance (in matlab toolbox).